[PATCH] [-cxx-abi microsoft] Mangle local TagDecls appropriately

[David Majnemer]

Hi rnk, rsmith, rjmccall,

When selecting a mangling for an anonymous tag type:
- We should first try it's typedef'd name.
- If that doesn't work, we should mangle in the name of the declarator
  that specified it as a declaration specifier.
- If that doesn't work, fall back to a static mangling of
  <unnamed-type>.

This should make our anonymous type mangling compatible.

This partially fixes PR16994; we would need to have an implementation of
scope numbering to get it right (a separate issue).

http://llvm-reviews.chandlerc.com/D1540

Files:
  include/clang/AST/Decl.h
  lib/AST/Decl.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/Sema/SemaDecl.cpp
  lib/Serialization/ASTReaderDecl.cpp
  lib/Serialization/ASTWriterDecl.cpp
  test/CodeGenCXX/mangle-ms.cpp
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