[PATCH] [X86] A first stab at a heuristic to estimate the size impact for converting movs to pushes

[Michael Kuperstein]

Same as before, but with a flow that makes a bit more sense.


http://reviews.llvm.org/D7561

Files:
  lib/Target/X86/X86CallFrameOptimization.cpp
  test/CodeGen/X86/movtopush.ll

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