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

[Alexander Richardson via llvm-commits]

================
@@ -4293,6 +4293,12 @@ void SelectionDAGBuilder::visitGetElementPtr(const User &I) {
   SDLoc dl = getCurSDLoc();
   auto &TLI = DAG.getTargetLoweringInfo();
   GEPNoWrapFlags NW = cast<GEPOperator>(I).getNoWrapFlags();
+  unsigned int AddOpcode = ISD::PTRADD;
+
+  if (!DAG.getTarget().shouldPreservePtrArith(
----------------
arichardson wrote:

Use getMemBasePlusOffset below instead?

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