[PATCH] D15754: AMDGPU/SI: Simplify validation of flat instructions optional operands

[Tom Stellard via llvm-commits]

tstellarAMD created this revision.
tstellarAMD added a reviewer: arsenm.
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Use the target hook validateTargetOprandClass() for doing validation
on optional operands.  This will help prevent us from getting "invalid
operand" errors in cases where we should see a different error mesaage.

http://reviews.llvm.org/D15754

Files:
  lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
  lib/Target/AMDGPU/SIInstrInfo.td

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