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[AMDGPU][Waitcnt] Remove the old waitcnt pass

Authored by msearles on May 7 2018, 7:43 AM.

Description

[AMDGPU][Waitcnt] Remove the old waitcnt pass

Remove the old waitcnt pass ( si-insert-waits ), which is no longer maintained
and getting crufty

Differential Revision: https://reviews.llvm.org/D46448

llvm-svn: 331641