[PATCH] [MachineSink+PGO] Teach MachineSink to use BlockFrequencyInfo

[Bruno Cardoso Lopes]

Thanks for the feedback,

Updated the patch to include a test-case.

Manman, they're collected with train data and tested on train data.
Chad, I've tested it only on darwin x86-64.

http://reviews.llvm.org/D5447

Files:
  lib/CodeGen/MachineSink.cpp
  test/CodeGen/X86/sink-blockfreq.ll
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