[llvm] [AMDGPU] Add register allocation handoff intrinsic (PR #219842)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/CodeGen/MachineInstr.h llvm/include/llvm/CodeGen/TargetLowering.h llvm/include/llvm/MC/MCInstrDesc.h llvm/lib/CodeGen/BranchFolding.cpp llvm/lib/CodeGen/EarlyIfConversion.cpp llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp llvm/lib/CodeGen/MachineCSE.cpp llvm/lib/CodeGen/MachineLICM.cpp llvm/lib/CodeGen/MachinePipeliner.cpp llvm/lib/CodeGen/MachineSink.cpp llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp llvm/lib/Target/AMDGPU/AMDGPURegBankSelect.cpp llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp llvm/lib/Target/AMDGPU/SIISelLowering.cpp llvm/lib/Target/AMDGPU/SIISelLowering.h llvm/lib/Target/AMDGPU/SIInstrInfo.cpp llvm/utils/TableGen/Common/CodeGenInstruction.cpp llvm/utils/TableGen/Common/CodeGenInstruction.h llvm/utils/TableGen/InstrDocsEmitter.cpp llvm/utils/TableGen/InstrInfoEmitter.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/CodeGen/MachinePipeliner.cpp b/llvm/lib/CodeGen/MachinePipeliner.cpp
index bdb9ac9af..230dbf8d1 100644
--- a/llvm/lib/CodeGen/MachinePipeliner.cpp
+++ b/llvm/lib/CodeGen/MachinePipeliner.cpp
@@ -633,9 +633,8 @@ bool MachinePipeliner::canPipelineLoop(MachineLoop &L) {
                            "instruction\n");
       NumFailNotDuplicable++;
       ORE->emit([&]() {
-        return MachineOptimizationRemarkAnalysis(
-                   DEBUG_TYPE, "canPipelineLoop", L.getStartLoc(),
-                   L.getHeader())
+        return MachineOptimizationRemarkAnalysis(DEBUG_TYPE, "canPipelineLoop",
+                                                 L.getStartLoc(), L.getHeader())
                << "Contains a non-duplicable instruction";
       });
       return false;

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https://github.com/llvm/llvm-project/pull/219842