[PATCH] Outline cleanup handlers for native Windows C++ exception handling

[Andy Kaylor]

Added comments clarifying the state of cleanup support.
Switched begin/end catch replacement to unreachable for cleanup cloning.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7865

Files:
  lib/CodeGen/WinEHPrepare.cpp
  test/CodeGen/X86/cppeh-catch-all.ll
  test/CodeGen/X86/cppeh-catch-scalar.ll
  test/CodeGen/X86/cppeh-frame-vars.ll
  test/CodeGen/X86/cppeh-min-unwind.ll

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