[PATCH] Recover from missing typenames on template args for MSVC compatibility

[Reid Kleckner]

Hi rsmith,

While matching a non-type template argument against a known template
type parameter we now modify the AST's TemplateArgumentLoc to assume the
user wrote typename.  Under -fms-compatibility, we downgrade our
diagnostic from an error to an extwarn.

http://reviews.llvm.org/D4049

Files:
  include/clang/AST/TemplateBase.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaTemplate.cpp
  test/SemaTemplate/typename-specifier.cpp
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