[clang] [llvm] [X86][APX] Return CopyMI when added in foldMemoryOperandImpl (PR #191368)

[Matt Arsenault via cfe-commits]

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@@ -151,11 +151,21 @@ bool LiveRangeEdit::foldAsLoad(LiveInterval *LI,
   if (UseMI->readsWritesVirtualRegister(LI->reg(), &Ops).second)
     return false;
 
-  MachineInstr *FoldMI = TII.foldMemoryOperand(*UseMI, Ops, *DefMI, &LIS);
+  MachineInstr *CopyMI = nullptr;
+  MachineInstr *FoldMI =
+      TII.foldMemoryOperand(*UseMI, Ops, *DefMI, CopyMI, &LIS);
   if (!FoldMI)
     return false;
   LLVM_DEBUG(dbgs() << "                folded: " << *FoldMI);
-  LIS.ReplaceMachineInstrInMaps(*UseMI, *FoldMI);
+  SlotIndex FoldIdx = LIS.ReplaceMachineInstrInMaps(*UseMI, *FoldMI);
+  if (CopyMI) {
+    SlotIndex CopyIdx = LIS.InsertMachineInstrInMaps(*CopyMI).getRegSlot();
+    if (!MRI.isSSA()) {
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arsenm wrote:

This is always not ssa?

https://github.com/llvm/llvm-project/pull/191368