AMDGPU: Add instruction definitions for some scratch_* instructions

Omit atomics for now since they probably aren't useful.

llvm-svn: 308747
diff --git a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
index 4c755be..b39d145 100644
--- a/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
+++ b/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.h
@@ -80,6 +80,7 @@
 
   MCOperand decodeOperand_SReg_32(unsigned Val) const;
   MCOperand decodeOperand_SReg_32_XM0_XEXEC(unsigned Val) const;
+  MCOperand decodeOperand_SReg_32_XEXEC_HI(unsigned Val) const;
   MCOperand decodeOperand_SReg_64(unsigned Val) const;
   MCOperand decodeOperand_SReg_64_XEXEC(unsigned Val) const;
   MCOperand decodeOperand_SReg_128(unsigned Val) const;