[llvm] [ReachingDefAnalysis] Extend the analysis to stack objects. (PR #118097)

[Mikhail Gudim via llvm-commits]

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@@ -48,12 +54,28 @@ static bool isValidRegDefOf(const MachineOperand &MO, MCRegister PhysReg,
   return TRI->regsOverlap(MO.getReg(), PhysReg);
 }
 
+static bool isFIDef(const MachineInstr &MI, int FrameIndex,
+                    const TargetInstrInfo *TII) {
+  int DefFrameIndex = 0;
+  int SrcFrameIndex = 0;
+  if (TII->isStoreToStackSlot(MI, DefFrameIndex) ||
+      TII->isStackSlotCopy(MI, DefFrameIndex, SrcFrameIndex)) {
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mgudim wrote:

I'll add a test for SystemZ which is the only target which has stack-slot copies

https://github.com/llvm/llvm-project/pull/118097