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[AMDGPU] Add convergent attribute to WWM.

Description

[AMDGPU] Add convergent attribute to WWM.

Add the convergent attribute to the WWM intrinsic to stop it ever being
sunk out of cfg.

Differential Revision: https://reviews.llvm.org/D59536

Details

Committed
sheredomMar 19 2019, 9:32 AM
Differential Revision
D59536: [AMDGPU] Add convergent attribute to WWM.
Parents
rL356469: Remove a couple of log statements.
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