[llvm] [SelectionDAG] Introduce ISD::PTRADD (PR #140017)

[Jessica Clarke via llvm-commits]

================
@@ -2388,7 +2391,7 @@ static bool canFoldInAddressingMode(SDNode *N, SDNode *Use, SelectionDAG &DAG,
   }
 
   TargetLowering::AddrMode AM;
-  if (N->getOpcode() == ISD::ADD) {
+  if (N->getOpcode() == ISD::ADD || N->getOpcode() == ISD::PTRADD) {
----------------
jrtc27 wrote:

It's present in Morello LLVM. No reason not to include this IMO, it makes this change more universally applicable.

https://github.com/llvm/llvm-project/pull/140017