[PATCH] Extended support for native Windows C++ EH outlining

[Andy Kaylor]

Rebased to incorporate the recently committed patches.
Refactored to eliminate duplicate code.
Updated the landingpad replacement to properly preserve exception argument variables and indirect branch targets.
Added a mapping scheme to eliminate duplicate parsing of blocks shared between landing pads.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7886

Files:
  include/llvm/Transforms/Utils/Cloning.h
  lib/CodeGen/WinEHPrepare.cpp
  lib/Transforms/Utils/CloneFunction.cpp
  test/CodeGen/WinEH/cppeh-catch-all.ll
  test/CodeGen/WinEH/cppeh-catch-scalar.ll
  test/CodeGen/WinEH/cppeh-frame-vars.ll
  test/CodeGen/WinEH/cppeh-inalloca.ll
  test/CodeGen/WinEH/cppeh-min-unwind.ll
  test/CodeGen/WinEH/cppeh-nested-2.ll
  test/CodeGen/WinEH/cppeh-nonalloca-frame-values.ll

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