[AMDGPU][MC] Corrected disassembler for proper decoding of v_mqsad_u32_u8

See Bug 33639: https://bugs.llvm.org//show_bug.cgi?id=33639

Reviewers: vpykhtin, artem.tamazov

Differential Revision: https://reviews.llvm.org/D34892

llvm-svn: 308303
diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
index 3d71db9..4c755be 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
@@ -70,6 +70,7 @@
   MCOperand decodeOperand_VGPR_32(unsigned Val) const;
   MCOperand decodeOperand_VS_32(unsigned Val) const;
   MCOperand decodeOperand_VS_64(unsigned Val) const;
+  MCOperand decodeOperand_VS_128(unsigned Val) const;
   MCOperand decodeOperand_VSrc16(unsigned Val) const;
   MCOperand decodeOperand_VSrcV216(unsigned Val) const;