[clang-scan-deps] Enable test P1689.cppm on Windows

The test `test/ClangScanDeps/P1689.cppm` was previously not supported
on Windows due to the differences in path separators between Windows
and Linux. This normalizes the paths, allowing this test to run on
Windows as well.

This is motivated by the review feedback for llvm#145221, where the same
change was suggested for a test derived from this one.

Author: naveen-seth

clang/test/ClangScanDeps/P1689.cppm

@@ -1,56 +1,65 @@
 // UNSUPPORTED: target={{.*}}-aix{{.*}}
 //
-// The slash direction in linux and windows are different.
-// UNSUPPORTED: system-windows
-//
 // RUN: rm -fr %t
 // RUN: mkdir -p %t
 // RUN: split-file %s %t
 //
 // RUN: sed "s|DIR|%/t|g" %t/P1689.json.in > %t/P1689.json
 // RUN: clang-scan-deps -compilation-database %t/P1689.json -format=p1689 | FileCheck %t/Checks.cpp -DPREFIX=%/t
-// RUN: clang-scan-deps --mode=preprocess-dependency-directives -compilation-database %t/P1689.json -format=p1689 | FileCheck %t/Checks.cpp -DPREFIX=%/t
+// RUN: clang-scan-deps --mode=preprocess-dependency-directives -compilation-database %t/P1689.json -format=p1689 \
+// RUN:   | sed 's:\\\\\?:/:g' \
+// RUN:   | FileCheck %t/Checks.cpp -DPREFIX=%/t
 //
 // Check the separated dependency format. This is required by CMake for the case
 // that we have non-exist files in a fresh build and potentially out-of-date after that.
 // So the build system need to wrtie a compilation database just for scanning purposes,
 // which is not so good. So here is the per file mode for P1689.
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t %t/M.cppm -o %t/M.o \
+// RUN:   | sed 's:\\\\\?:/:g' \
 // RUN:   | FileCheck %t/M.cppm -DPREFIX=%/t
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t %t/Impl.cpp -o %t/Impl.o \
+// RUN:   | sed 's:\\\\\?:/:g' \
 // RUN:   | FileCheck %t/Impl.cpp -DPREFIX=%/t
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t %t/impl_part.cppm -o %t/impl_part.o \
+// RUN:   | sed 's:\\\\\?:/:g' \
 // RUN:   | FileCheck %t/impl_part.cppm -DPREFIX=%/t
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t %t/interface_part.cppm -o %t/interface_part.o \
+// RUN:   | sed 's:\\\\\?:/:g' \
 // RUN:   | FileCheck %t/interface_part.cppm -DPREFIX=%/t
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t %t/User.cpp -o %t/User.o \
+// RUN:   | sed 's:\\\\\?:/:g' \
 // RUN:   | FileCheck %t/User.cpp -DPREFIX=%/t
 //
 // Check we can generate the make-style dependencies as expected.
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t %t/impl_part.cppm -o %t/impl_part.o \
 // RUN:      -MT %t/impl_part.o.ddi -MD -MF %t/impl_part.dep
-// RUN:   cat %t/impl_part.dep | FileCheck %t/impl_part.cppm -DPREFIX=%/t --check-prefix=CHECK-MAKE
+// RUN: cat %t/impl_part.dep \
+// RUN:   | sed 's:\\\\\?:/:g' \
+// RUN:   | FileCheck %t/impl_part.cppm -DPREFIX=%/t --check-prefix=CHECK-MAKE
 //
 // Check that we can generate multiple make-style dependency information with compilation database.
 // RUN: cat %t/P1689.dep | FileCheck %t/Checks.cpp -DPREFIX=%/t --check-prefix=CHECK-MAKE
 //
 // Check that we can mix the use of -format=p1689 and -fmodules.
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/cache -c %t/impl_part.cppm -o %t/impl_part.o \
+// RUN:   | sed 's:\\\\\?:/:g' \
 // RUN:   | FileCheck %t/impl_part.cppm -DPREFIX=%/t
 //
 // Check the path in the make style dependencies are generated in relative path form
 // RUN: cd %t
 // RUN: clang-scan-deps -format=p1689 \
 // RUN:   -- %clang++ -std=c++20 -c -fprebuilt-module-path=%t impl_part.cppm -o impl_part.o \
 // RUN:      -MT impl_part.o.ddi -MD -MF impl_part.dep
-// RUN:   cat impl_part.dep | FileCheck impl_part.cppm -DPREFIX=%/t --check-prefix=CHECK-MAKE-RELATIVE
+// RUN: cat impl_part.dep \
+// RUN:   | sed 's:\\\\\?:/:g' \
+// RUN:   | FileCheck impl_part.cppm -DPREFIX=%/t --check-prefix=CHECK-MAKE-RELATIVE
 
 
 //--- P1689.json.in