Matt Arsenault db7781c6e9 AMDGPU: Run SIInsertWaits as pre-emit pass ...

Running this after the scheduler enables scheduling
waits later so other ALU instructions can run while
this would be waiting.

When combined with enabling the post-RA scheduler, this
gives about a ~20% improvement on sgemm.

llvm-svn: 241473

2015-07-06 17:02:20 +00:00

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