[PATCH] MS ABI: Mangle empty type parameter packs compatibly

[David Majnemer]

Hi rsmith, rnk,

The MS mangling scheme apparently has separate manglings for type and
non-type parameter packs when they are empty.  Add state to
TemplateArgument to track this.

http://reviews.llvm.org/D4792

Files:
  include/clang/AST/TemplateBase.h
  lib/AST/ASTContext.cpp
  lib/AST/ASTImporter.cpp
  lib/AST/DeclTemplate.cpp
  lib/AST/ExprCXX.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/AST/TemplateBase.cpp
  lib/AST/TemplateName.cpp
  lib/AST/Type.cpp
  lib/Sema/SemaTemplate.cpp
  lib/Sema/SemaTemplateDeduction.cpp
  lib/Serialization/ASTReader.cpp
  test/CodeGenCXX/mangle-ms-cxx11.cpp
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