[llvm] [ExtendLifetimes] Implement llvm.fake.use to extend variable lifetimes (PR #86149)

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git-clang-format --diff f5c90f3000bc75a344bf01bd4e0401e3fb7f9453 c6d6ccd97116d514c99aa50928131dab8340c8be -- llvm/include/llvm/Analysis/PtrUseVisitor.h llvm/include/llvm/CodeGen/ISDOpcodes.h llvm/include/llvm/CodeGen/MachineInstr.h llvm/include/llvm/CodeGen/SelectionDAGISel.h llvm/lib/CodeGen/Analysis.cpp llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp llvm/lib/CodeGen/CodeGenPrepare.cpp llvm/lib/CodeGen/DeadMachineInstructionElim.cpp llvm/lib/CodeGen/MachineCSE.cpp llvm/lib/CodeGen/MachineScheduler.cpp llvm/lib/CodeGen/SelectionDAG/FastISel.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h llvm/lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp llvm/lib/IR/Instruction.cpp llvm/lib/IR/Verifier.cpp llvm/lib/Target/X86/X86FloatingPoint.cpp llvm/lib/Transforms/Scalar/SROA.cpp llvm/lib/Transforms/Utils/CloneFunction.cpp llvm/lib/Transforms/Utils/Local.cpp llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
index c3c7f48677..a1e33d4b67 100644
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -406,7 +406,8 @@ bool MachineCSE::PhysRegDefsReach(MachineInstr *CSMI, MachineInstr *MI,
 
 bool MachineCSE::isCSECandidate(MachineInstr *MI) {
   if (MI->isPosition() || MI->isPHI() || MI->isImplicitDef() || MI->isKill() ||
-      MI->isInlineAsm() || MI->isDebugInstr() || MI->isJumpTableDebugInfo() || MI->isFakeUse())
+      MI->isInlineAsm() || MI->isDebugInstr() || MI->isJumpTableDebugInfo() ||
+      MI->isFakeUse())
     return false;
 
   // Ignore copies.

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https://github.com/llvm/llvm-project/pull/86149