[AMDGPU] Fix for branch offset hardware workaround

Summary:
This fixes a hardware bug that makes a branch offset of 0x3f unsafe.
This replaces the 32 bit branch with offset 0x3f to a 64 bit
instruction that includes the same 32 bit branch and the encoding
for a s_nop 0 to follow. The relaxer than modifies the offsets
accordingly.

Change-Id: I10b7aed99d651f8159401b01bb421f105fa6288e

Subscribers: arsenm, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63494

llvm-svn: 364451
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
index b56dad8..5497fe1 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
@@ -190,6 +190,9 @@
 LLVM_READONLY
 int16_t getNamedOperandIdx(uint16_t Opcode, uint16_t NamedIdx);
 
+LLVM_READONLY
+int getSOPPWithRelaxation(uint16_t Opcode);
+
 struct MIMGBaseOpcodeInfo {
   MIMGBaseOpcode BaseOpcode;
   bool Store;