Bring r325915 back.

The tests that failed on a windows host have been fixed.

Original message:

Start setting dso_local for COFF.

With this there are still some GVs where we don't set dso_local
because setGVProperties is never called. I intend to fix that in
followup commits. This is just the bare minimum to teach
shouldAssumeDSOLocal what it should do for COFF.

llvm-svn: 325940
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 65342fe..c8b2d78 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -723,6 +723,9 @@
 
   void setDSOLocal(llvm::GlobalValue *GV) const;
 
+  /// Set visibility and dso_local.
+  /// This must be called after dllimport/dllexport is set.
+  /// FIXME: should this set dllimport/dllexport instead?
   void setGVProperties(llvm::GlobalValue *GV, const NamedDecl *D) const;
 
   /// Set the TLS mode for the given LLVM GlobalValue for the thread-local