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[AMDGPU] removed dead code handling rmw in memory legalizer

Description

[AMDGPU] removed dead code handling rmw in memory legalizer

It was always using cmpxchg path and in rmw and cmpxchg instructions
are not distinguishable in the BE.

Differential Revision: https://reviews.llvm.org/D42976

Details

Committed
rampitecFeb 6 2018, 11:11 AM
Differential Revision
D42976: [AMDGPU] removed dead code handling rmw in memory legalizer
Parents
rL324382: [clangd] Attempt to unbreak windows buildbots.
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