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

[Jingyue Wu]

PR20776 blocks submitting this diff which is not really the culprit. To move
things forward, I add a flag to use MachinePostDominatorTree only when
specified in the command line, so that people can experiment it. After PR20776
is resolved, I will remove this flag and let MachineSinking always use
MachinePostDominatorTree.

Owen and Jiangning, is this temporary work around OK with you?

http://reviews.llvm.org/D4814

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