[llvm] Xtensa] Implement windowed call ABI. (PR #130001)

[Matt Arsenault via llvm-commits]

================
@@ -1385,6 +1389,16 @@ MachineBasicBlock *XtensaTargetLowering::EmitInstrWithCustomInserter(
     }
     return MBB;
   }
+  case Xtensa::MOVSP_P: {
+    MachineOperand SP = MI.getOperand(0);
+    MachineOperand NewSP = MI.getOperand(1);
----------------
arsenm wrote:

```suggestion
    MachineOperand SP = &MI.getOperand(0);
    MachineOperand NewSP = &MI.getOperand(1);
```

https://github.com/llvm/llvm-project/pull/130001