[PATCH] MS ABI: Implement copy-ctor closures, finish implementing throw

[David Majnemer]

Hi rnk,

This adds support for copy-constructor closures.  These are generated
when the C++ runtime has to call a copy-constructor with a particular
calling convention or with default arguments substituted in to the call.

Because the runtime has no mechanism to call the function with a
different calling convention or know-how to evaluate the default
arguments at run-time, we create a thunk which will do all the
appropriate work and package it in a way the runtime can use.

http://reviews.llvm.org/D8225

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/Mangle.h
  include/clang/Basic/ABI.h
  lib/AST/ASTContext.cpp
  lib/AST/CXXABI.h
  lib/AST/ItaniumCXXABI.cpp
  lib/AST/ItaniumMangle.cpp
  lib/AST/MicrosoftCXXABI.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CodeGenTypes.h
  lib/CodeGen/MicrosoftCXXABI.cpp
  lib/Sema/SemaExprCXX.cpp
  test/CodeGenCXX/microsoft-abi-throw.cpp

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