[llvm] [AArch64] Add CodeGen support for FEAT_CPA (PR #105669)

[Alexander Richardson via llvm-commits]

================
@@ -4368,7 +4374,7 @@ void SelectionDAGBuilder::visitGetElementPtr(const User &I) {
 
         OffsVal = DAG.getSExtOrTrunc(OffsVal, dl, N.getValueType());
 
-        N = DAG.getNode(ISD::ADD, dl, N.getValueType(), N, OffsVal, Flags);
+        N = DAG.getNode(AddOpcode, dl, N.getValueType(), N, OffsVal, Flags);
----------------
arichardson wrote:

getMemBasePlusOffset?

https://github.com/llvm/llvm-project/pull/105669