[llvm] [AMDGPU] Prevent cyclic behaviour in SIFoldOperands (PR #82099)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff b366643ca3d780931afed6bff7148a4822e51119 6cc801800fef4bbc0f0f5711145d4097a5381ad9 -- llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
index 808412809c..8ad94ee1de 100644
--- a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -75,7 +75,7 @@ public:
   const SIRegisterInfo *TRI;
   const GCNSubtarget *ST;
   const SIMachineFunctionInfo *MFI;
-  
+
   bool frameIndexMayFold(const MachineInstr &UseMI, int OpNo,
                          const MachineOperand &OpToFold) const;
 
@@ -773,7 +773,7 @@ void SIFoldOperands::foldOperand(
   if (UseMI->isRegSequence()) {
     Register RegSeqDstReg = UseMI->getOperand(0).getReg();
     unsigned RegSeqDstSubReg = UseMI->getOperand(UseOpIdx + 1).getImm();
-    static std::unordered_set<MachineInstr*> seenMI;
+    static std::unordered_set<MachineInstr *> seenMI;
     for (auto &RSUse : make_early_inc_range(MRI->use_nodbg_operands(RegSeqDstReg))) {
       MachineInstr *RSUseMI = RSUse.getParent();
 
@@ -783,11 +783,11 @@ void SIFoldOperands::foldOperand(
 
       if (RSUse.getSubReg() != RegSeqDstSubReg)
         continue;
-      
+
       if (seenMI.count(RSUseMI) != 0)
         continue;
       seenMI.insert(RSUseMI);
-      
+
       foldOperand(OpToFold, RSUseMI, RSUseMI->getOperandNo(&RSUse), FoldList,
                   CopiesToReplace);
     }

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https://github.com/llvm/llvm-project/pull/82099