[PATCH] [X86] Split information collection from actual transformation in call frame optimization (mov -> push)

[Michael Kuperstein]

Hi rnk,

This splits collecting information from actually performing the transformation, so that we can add a heuristic in between the two.
NFC.

http://reviews.llvm.org/D7497

Files:
  lib/Target/X86/X86CallFrameOptimization.cpp

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