[test] Fix tests that use Swift include directory in unified builds (swiftlang#78586)

In LLVM unified builds, Swift normally lives in `tools/swift` and the
paths from the CMake build directory are not always the same as in
a standalone build.

Fix some tests using `%clang-include-dir` (which effectively points to
`$CMAKE_BUILD_ROOT/include`) to use the new `%swift-include-dir`, which
should point to the right `include/` directory in both unified and
standalone builds.

Additionally, change the calculation of `%clang-include-dir` to not be
relative to the `swift` binary, but to the CMake build root instead.

Author: drodriguez

test/IRGen/prespecialized-metadata/class-class-flags-run.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx
 
-// RUN: %target-build-swift -v %mcp_opt %s %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -L %clang-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
+// RUN: %target-build-swift -v %mcp_opt %s %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -L %swift-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main
 

test/IRGen/prespecialized-metadata/enum-extradata-run.swift

@@ -1,9 +1,9 @@
 // RUN: %empty-directory(%t)
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/extraDataFields.cpp -o %t/extraDataFields.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/extraDataFields.cpp -o %t/extraDataFields.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx
 
 // RUN: %target-build-swift -c %S/Inputs/enum-extra-data-fields.swift -emit-library -emit-module -enable-library-evolution -module-name ExtraDataFieldsNoTrailingFlags -target %module-target-future -Xfrontend -disable-generic-metadata-prespecialization -emit-module-path %t/ExtraDataFieldsNoTrailingFlags.swiftmodule -o %t/%target-library-name(ExtraDataFieldsNoTrailingFlags)
 // RUN: %target-build-swift -c %S/Inputs/enum-extra-data-fields.swift -emit-library -emit-module -enable-library-evolution -module-name ExtraDataFieldsTrailingFlags -target %module-target-future -Xfrontend -prespecialize-generic-metadata -emit-module-path %t/ExtraDataFieldsTrailingFlags.swiftmodule -o %t/%target-library-name(ExtraDataFieldsTrailingFlags)
-// RUN: %target-build-swift -v %mcp_opt %s %t/extraDataFields.o -import-objc-header %S/Inputs/extraDataFields.h -Xfrontend -disable-generic-metadata-prespecialization -target %module-target-future -lc++ -L %clang-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main -I %t -L %t -lExtraDataFieldsTrailingFlags -lExtraDataFieldsNoTrailingFlags -module-name main
+// RUN: %target-build-swift -v %mcp_opt %s %t/extraDataFields.o -import-objc-header %S/Inputs/extraDataFields.h -Xfrontend -disable-generic-metadata-prespecialization -target %module-target-future -lc++ -L %swift-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main -I %t -L %t -lExtraDataFieldsTrailingFlags -lExtraDataFieldsNoTrailingFlags -module-name main
 
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main | %FileCheck %s

test/IRGen/prespecialized-metadata/enum-trailing-flags-run.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx
 
-// RUN: %target-build-swift -v %mcp_opt %s %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -L %clang-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
+// RUN: %target-build-swift -v %mcp_opt %s %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -L %swift-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main
 

test/IRGen/prespecialized-metadata/struct-extradata-run.swift

@@ -1,9 +1,9 @@
 // RUN: %empty-directory(%t)
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/extraDataFields.cpp -o %t/extraDataFields.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx -I %swift_obj_root/include
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/extraDataFields.cpp -o %t/extraDataFields.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx -I %swift_obj_root/include
 
 // RUN: %target-build-swift -c %S/Inputs/struct-extra-data-fields.swift -emit-library -emit-module -module-name ExtraDataFieldsNoTrailingFlags -target %module-target-future -Xfrontend -disable-generic-metadata-prespecialization -emit-module-path %t/ExtraDataFieldsNoTrailingFlags.swiftmodule -o %t/%target-library-name(ExtraDataFieldsNoTrailingFlags)
 // RUN: %target-build-swift -c %S/Inputs/struct-extra-data-fields.swift -emit-library -emit-module -module-name ExtraDataFieldsTrailingFlags -target %module-target-future -Xfrontend -prespecialize-generic-metadata -emit-module-path %t/ExtraDataFieldsTrailingFlags.swiftmodule -o %t/%target-library-name(ExtraDataFieldsTrailingFlags)
-// RUN: %target-build-swift -v %mcp_opt %s %t/extraDataFields.o -import-objc-header %S/Inputs/extraDataFields.h -Xfrontend -disable-generic-metadata-prespecialization -target %module-target-future -lc++ -L %clang-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main -I %t -L %t -lExtraDataFieldsTrailingFlags -lExtraDataFieldsNoTrailingFlags -module-name main
+// RUN: %target-build-swift -v %mcp_opt %s %t/extraDataFields.o -import-objc-header %S/Inputs/extraDataFields.h -Xfrontend -disable-generic-metadata-prespecialization -target %module-target-future -lc++ -L %swift-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main -I %t -L %t -lExtraDataFieldsTrailingFlags -lExtraDataFieldsNoTrailingFlags -module-name main
 
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main | %FileCheck %s

test/IRGen/prespecialized-metadata/struct-multi-conformance.swift

@@ -5,8 +5,8 @@
 // RUN: %target-build-swift -c %s -DCONFORMANCE_2 -emit-library -emit-module -module-name Conformance2 -target %module-target-future -Xfrontend -prespecialize-generic-metadata -emit-module-path %t/Conformance2.swiftmodule -o %t/%target-library-name(Conformance2) -lBase -I %t -L %t
 // RUN: %target-build-swift -c %s -DGENERIC -emit-library -emit-module -module-name Generic -target %module-target-future -Xfrontend -prespecialize-generic-metadata -emit-module-path %t/Generic.swiftmodule -o %t/%target-library-name(Generic) -lBase -lConformance1 -I %t -L %t
 // RUN: %target-build-swift -c %s -DERASE -emit-library -emit-module -module-name Erase -target %module-target-future -Xfrontend -prespecialize-generic-metadata -emit-module-path %t/Erase.swiftmodule -o %t/%target-library-name(Erase) -lBase -lConformance2 -I %t -L %t
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx
-// RUN: %target-build-swift %s %S/Inputs/main.swift %S/Inputs/consume-logging-metadata-value.swift %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -DMAIN -target %module-target-future -Xfrontend -prespecialize-generic-metadata -lBase -lConformance1 -lConformance2 -lGeneric -lErase -lc++ -I %t -L %t -L %clang-include-dir/../lib/swift/macosx -o %t/main
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx
+// RUN: %target-build-swift %s %S/Inputs/main.swift %S/Inputs/consume-logging-metadata-value.swift %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -DMAIN -target %module-target-future -Xfrontend -prespecialize-generic-metadata -lBase -lConformance1 -lConformance2 -lGeneric -lErase -lc++ -I %t -L %t -L %swift-include-dir/../lib/swift/macosx -o %t/main
 
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main | %FileCheck %s

test/IRGen/prespecialized-metadata/struct-outmodule-run.swift

@@ -1,9 +1,9 @@
 // RUN: %empty-directory(%t)
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx
 
 // RUN: %target-build-swift %S/Inputs/struct-public-nonfrozen-1argument.swift -emit-module -emit-library -module-name Module -Xfrontend -prespecialize-generic-metadata -target %module-target-future -emit-module-path %t/Module.swiftmodule -o %t/%target-library-name(Module)
 
-// RUN: %target-build-swift -v %mcp_opt %s %S/Inputs/main.swift %S/Inputs/consume-logging-metadata-value.swift %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -I %t -L %t -lModule -L %clang-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
+// RUN: %target-build-swift -v %mcp_opt %s %S/Inputs/main.swift %S/Inputs/consume-logging-metadata-value.swift %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -I %t -L %t -lModule -L %swift-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main | %FileCheck %s
 

test/IRGen/prespecialized-metadata/struct-trailing-flags-run.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t)
-// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %clang-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %clang-include-dir/../lib/swift/macosx
+// RUN: %clang -c -std=c++17 -v %target-cc-options %target-threading-opt -g -O0 -isysroot %sdk %S/Inputs/isPrespecialized.cpp -o %t/isPrespecialized.o -I %swift-include-dir -I %swift_src_root/include/ -I %swift_src_root/stdlib/public/SwiftShims/ -I %llvm_src_root/include -I %llvm_obj_root/include -L %swift-include-dir/../lib/swift/macosx
 
-// RUN: %target-build-swift -v %mcp_opt %s %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -L %clang-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
+// RUN: %target-build-swift -v %mcp_opt %s %t/isPrespecialized.o -import-objc-header %S/Inputs/isPrespecialized.h -Xfrontend -prespecialize-generic-metadata -target %module-target-future -lc++ -L %swift-include-dir/../lib/swift/macosx -sdk %sdk -o %t/main
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main
 

test/lit.cfg

@@ -707,15 +707,18 @@ config.substitutions.append( ('%swift-parse-test', config.swift_parse_test) )
 config.substitutions.append( ('%swift-scan-test', config.swift_scan_test) )
 config.substitutions.append( ('%validate-json', f"{config.python} -m json.tool") )
 
+config.clang_include_dir = make_path(config.llvm_obj_root, 'include')
+config.substitutions.append( ('%clang-include-dir', config.clang_include_dir) )
+
+config.swift_include_dir = make_path(config.swift_obj_root, 'include')
+config.substitutions.append( ('%swift-include-dir', config.swift_include_dir) )
+
 # This must come after all substitutions containing "%swift".
 config.substitutions.append(
     ('%swift',
      "%r %s -disable-objc-attr-requires-foundation-module %s %s"
        % (config.swift_frontend, mcp_opt, config.swift_test_options, config.swift_frontend_test_options)) )
 
-config.clang_include_dir = make_path(config.swift, '..', '..', 'include')
-config.substitutions.append( ('%clang-include-dir', config.clang_include_dir) )
-
 # Use this to build the basic set of Objective-C overlays.
 config.substitutions.append(('%build-clang-importer-objc-overlays',
                              '%target-swift-frontend(mock-sdk: %clang-importer-sdk-nosource -I %t) -enable-objc-interop -emit-module -o %t %clang-importer-sdk-path/swift-modules/ObjectiveC.swift -disable-objc-attr-requires-foundation-module && '