[PATCH] [WinEH] Demote values live across exception handlers up front

[Reid Kleckner]

- Address comments


http://reviews.llvm.org/D9158

Files:
  lib/CodeGen/WinEHPrepare.cpp
  test/CodeGen/WinEH/cppeh-demote-liveout.ll
  test/CodeGen/WinEH/cppeh-inalloca.ll
  test/CodeGen/WinEH/cppeh-multi-catch.ll
  test/CodeGen/WinEH/cppeh-nonalloca-frame-values.ll

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