[AMDGPU] Fix a warning

This patch fixes:

  llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:800:17:
  error: unused variable 'DST_IDX' [-Werror,-Wunused-variable]

diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
index 7e11cd4..9011b4b 100644 (file)
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
@@ -808,6 +808,7 @@ bool AMDGPUDisassembler::isMacDPP(MCInst &MI) const {
     assert(Desc.getOperandConstraint(
                AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src2),
                MCOI::OperandConstraint::TIED_TO) == DST_IDX);
+    (void)DST_IDX;
     return true;
   }