[llvm] [LiveVariables] Mark use as implicit-def if def is a subregister (PR #119446)

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``````````bash
git-clang-format --diff 62a25a4c7c3b291f0805894926419f1a64cd83f8 59393473a837dc822efc369cf775adfe5561f091 --extensions cpp -- llvm/lib/CodeGen/LiveVariables.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/LiveVariables.cpp b/llvm/lib/CodeGen/LiveVariables.cpp
index e6753563a2..7de89e9d51 100644
--- a/llvm/lib/CodeGen/LiveVariables.cpp
+++ b/llvm/lib/CodeGen/LiveVariables.cpp
@@ -282,7 +282,8 @@ void LiveVariables::HandlePhysRegUse(Register Reg, MachineInstr &MI) {
         bool IsDefinedHere = false;
         for (int i = 0; i < LastPartialDef->getNumOperands(); ++i) {
           auto MO = LastPartialDef->getOperand(i);
-          if (!MO.isDef()) continue;
+          if (!MO.isDef())
+            continue;
           if (TRI->isSubRegister(SubReg, MO.getReg())) {
             IsDefinedHere = true;
             break;
@@ -290,9 +291,8 @@ void LiveVariables::HandlePhysRegUse(Register Reg, MachineInstr &MI) {
         }
         // This part of Reg was defined before the last partial def. It's killed
         // here.
-        LastPartialDef->addOperand(MachineOperand::CreateReg(SubReg,
-                                                             IsDefinedHere/*IsDef*/,
-                                                             true/*IsImp*/));
+        LastPartialDef->addOperand(MachineOperand::CreateReg(
+            SubReg, IsDefinedHere /*IsDef*/, true /*IsImp*/));
         PhysRegDef[SubReg] = LastPartialDef;
         for (MCPhysReg SS : TRI->subregs(SubReg))
           Processed.insert(SS);

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https://github.com/llvm/llvm-project/pull/119446