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

[David Green via llvm-commits]

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@@ -1462,6 +1462,10 @@ enum NodeType {
   // Outputs: [rv], output chain, glue
   PATCHPOINT,
 
+  // PTRADD represents pointer arithmetic semantics, for those targets which
+  // benefit from that information.
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davemgreen wrote:

// PTRADD represents pointer arithmatic semantics, for targets that opt in using shouldPreservePtrArith.
// ptr = PTRADD ptr, offset

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