DebugTypeExtRefs=false when DisableClangModuleSkeletonCUs=true

Author: rmaz

lib/IRGen/IRGenModule.cpp

@@ -113,7 +113,7 @@ static clang::CodeGenerator *createClangCodeGenerator(ASTContext &Context,
     break;
   case IRGenDebugInfoLevel::ASTTypes:
   case IRGenDebugInfoLevel::DwarfTypes:
-    CGO.DebugTypeExtRefs = true;
+    CGO.DebugTypeExtRefs = !Opts.DisableClangModuleSkeletonCUs;
     CGO.setDebugInfo(clang::codegenoptions::DebugInfoKind::FullDebugInfo);
     break;
   }

test/DebugInfo/ClangModuleBreadcrumbs.swift

@@ -7,6 +7,8 @@
 import ClangModule.SubModule
 import OtherClangModule.SubModule
 
+let _ = someFunc(0)
+
 // Check for Clang module breadcrumbs.
 // CHECK: !DICompileUnit(language: DW_LANG_{{ObjC|C99}},{{.*}} producer: "{{.*}}Swift
 // CHECK-SAME:           ClangModule
@@ -16,5 +18,9 @@ import OtherClangModule.SubModule
 // CHECK-SAME:           OtherClangModule
 // CHECK-SAME:           dwoId:
 
+// CHECK: !DICompileUnit(language: DW_LANG_{{ObjC|C99}},{{.*}} producer: "{{.*}}clang
+// CHECK-SAME:           ClangModule
+// CHECK-SAME:           dwoId:
+
 // NONE: DICompileUnit({{.*}}
 // NONE-NOT: DICompileUnit({{.*}}ClangModule

test/DebugInfo/Inputs/ClangModule.h

@@ -1,3 +1,5 @@
 struct Foo {};
 
 typedef struct Foo s_Foo;
+
+static __inline__ __attribute__((always_inline)) int someFunc(int x) { return x; }