[llvm] [SelectionDAG] Look through FREEZE in getCopyToRegs when checking isZExtFree (PR #195285)

[Matt Arsenault via llvm-commits]

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@@ -993,8 +993,13 @@ void RegsForValue::getCopyToRegs(SDValue Val, SelectionDAG &DAG,
                                *DAG.getContext(), *CallConv, RegVTs[Value])
                          : RegVTs[Value];
 
-    if (ExtendKind == ISD::ANY_EXTEND && TLI.isZExtFree(Val, RegisterVT))
-      ExtendKind = ISD::ZERO_EXTEND;
+    if (ExtendKind == ISD::ANY_EXTEND) {
+      SDValue PeeledVal = Val;
+      if (PeeledVal.getOpcode() == ISD::FREEZE)
+        PeeledVal = PeeledVal.getOperand(0);
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arsenm wrote:

Probably should introduce a utility function for this, since it seems to becoming a common problem 

https://github.com/llvm/llvm-project/pull/195285