[PATCH] D27553: AMDGPU: Fix commuting v_sub_u16

[Matt Arsenault via Phabricator via llvm-commits]

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The correct commutable opcode was set to itself, so this
was simply swapping the operands to commute instead of also
changing the opcode to v_subrrev_u16.


https://reviews.llvm.org/D27553

Files:
  lib/Target/AMDGPU/VOP2Instructions.td
  test/CodeGen/AMDGPU/sub.i16.ll

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