[PATCH] [MachineLICM] Sink instructions only if they are unlikely to be executed

[Daniel Jasper]

Hi qcolombet,

This is a more limited change which we can iterate on later.

Also remove the isCopy test, which probably isn't useful anymore.

http://reviews.llvm.org/D8451

Files:
  lib/CodeGen/MachineLICM.cpp
  test/CodeGen/X86/sink-cheap-instructions.ll

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