[PATCH] [-cxx-abi microsoft] Correctly identify Win32 entry points

[David Majnemer]

Hi rnk, rsmith, whunt, timurrrr,

This fixes several issues with the original implementation:
- Win32 entry points cannot be in namespaces
- A Win32 entry point cannot be a function template, diagnose if we it.
- Win32 entry points cannot be overloaded.
- Win32 entry points implicitly return, similar to main.

http://llvm-reviews.chandlerc.com/D1683

Files:
  include/clang/AST/Decl.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/AST/Decl.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaOverload.cpp
  test/SemaCXX/ms-overload-entry-point.cpp
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