[PATCH] [MachineSink] Use the real post dominator tree

[Jingyue Wu]

Thanks Jiangning. I think what you said makes sense.

Not combining movl and addl in loop-reduce-strength8.ll does not really affect
its ability to verify LoopStrengthReduce, so I think it's fine to leave a FIXME
in that test case.

http://reviews.llvm.org/D4814

Files:
  lib/CodeGen/MachineSink.cpp
  test/CodeGen/AArch64/arm64-atomic.ll
  test/CodeGen/NVPTX/machine-sink.ll
  test/CodeGen/X86/loop-strength-reduce8.ll
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