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

[Jingyue Wu]

Hi eliben, meheff,

Fixes a FIXME in MachineSinking. Instead of using the simple heuristics
in isPostDominatedBy, use the real MachinePostDominatorTree. The old
heuristics caused instructions to sink unnecessarily, and might create
register pressure.

http://reviews.llvm.org/D4814

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