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Author SHA1 Message Date
Matt Arsenault 61738cbcb6 AMDGPU: Implement readcyclecounter 
This matches the behavior of the HSAIL clock instruction.
s_realmemtime is used if the subtarget supports it, and falls
back to s_memtime if not.

Also introduces new intrinsics for each of s_memtime / s_memrealtime.

llvm-svn: 262119
 2016-02-27 08:53:46 +00:00