[PATCH] Handle nested landing pads in outlined catch handlers for Windows C++ EH

[Andy Kaylor]

Rebased to merge with latest WinEH changes.
Moved parseEHActions into WinEHPrepare and updated it to save the exception object frameescape index.
Updated the code that was previously parsing eh.actions calls in a different way.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8596

Files:
  include/llvm/CodeGen/WinEHFuncInfo.h
  lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
  lib/CodeGen/WinEHPrepare.cpp
  test/CodeGen/WinEH/cppeh-catch-unwind.ll
  test/CodeGen/WinEH/cppeh-nested-1.ll
  test/CodeGen/WinEH/cppeh-nested-3.ll

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