[PATCH] D18364: AMDGPU: Remove atomic inc/dec patterns

[Matt Arsenault via llvm-commits]

arsenm created this revision.
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There is no benefit to these since materializing the constant 1
requires the same number of instructions as materializing uint_max

http://reviews.llvm.org/D18364

Files:
  lib/Target/AMDGPU/SIInstructions.td
  test/CodeGen/AMDGPU/local-atomics.ll
  test/CodeGen/AMDGPU/local-atomics64.ll

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