[PATCH] Enhance machine CSE to capture more opportunities

[Jiangning Liu]

Hi,

Attached patch of fixing machine CSE changes TrivialCopyCoalescing to TrivialCopyPropagation, and essentially the change allows multi-users of a COPY machine instruction to propagate the source register. This way we would be able to catch more common subexpressions opportunities.

This patch has very good performance impact to a couple of spec benchmarks.

Thanks,
-Jiangning

http://reviews.llvm.org/D4736

Files:
  lib/CodeGen/MachineCSE.cpp
  test/CodeGen/AArch64/machine_cse.ll
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