[llvm] [DebugInfo][InstrRef] Copy instr-ref to replacement instrs in X86FixupSetCCPass (PR #159777)

[Jeremy Morse via llvm-commits]

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@@ -136,6 +136,12 @@ bool X86FixupSetCCPass::runOnMachineFunction(MachineFunction &MF) {
           .addReg(ZeroReg)
           .addReg(Reg0)
           .addImm(X86::sub_8bit);
+
+      // Transfer the debug-instr-number to the setcc.
+      if (unsigned InstrNum = ZExt->peekDebugInstrNum())
+        ZExt->getParent()->getParent()->makeDebugValueSubstitution(
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jmorse wrote:

I think we can just use the `MF` argument to the function rather than using get-parent twice.

https://github.com/llvm/llvm-project/pull/159777