[PATCH] Delete CC_Default and use the target default CC everywhere

[Reid Kleckner]

Hi rsmith,

Makes functions with implicit calling convention compatible with
function types with a matching explicit calling convention.  This fixes
things like calls to qsort(), which has an explicit __cdecl attribute on
the comparator in Windows headers.

Clang will now infer the calling convention from the declarator.  There
are two cases when the CC must be adjusted during redeclaration:
1. When defining a non-inline static method.
2. When redeclaring a function with an implicit or mismatched
convention.

Fixes PR13457, and allows clang to compile CommandLine.cpp for the
Microsoft C++ ABI.

Excellent test cases provided by Alexander Zinenko!

http://llvm-reviews.chandlerc.com/D1231

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/Type.h
  include/clang/Basic/Specifiers.h
  include/clang/Basic/TargetInfo.h
  lib/AST/ASTContext.cpp
  lib/AST/DumpXML.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/AST/Type.cpp
  lib/AST/TypePrinter.cpp
  lib/Basic/Targets.cpp
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/TargetInfo.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclCXX.cpp
  lib/Sema/SemaLookup.cpp
  lib/Sema/SemaType.cpp
  test/CodeGen/mrtd.c
  test/Sema/callingconv.c
  test/SemaCXX/calling-conv-compat.cpp
  test/SemaCXX/decl-microsoft-call-conv.cpp
  test/SemaCXX/virtual-override-x86.cpp
  tools/libclang/CXType.cpp
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