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

[Fabian Ritter via cfe-commits]

ritter-x2a wrote:

Hi @rgwott,
I'm working on changes in the AMDGPU backend that would benefit from the PTRADD SelectionDAG opcode that this PR adds. I understand that this PR is low priority for you right now, so I'd like to suggest extracting the relevant changes to enable PTRADD nodes (without the ARM/CPA-specific code) into a separate PR so that we can get them merged sooner. Would you be okay with that? If so, I can create a new PR with the extracted changes (setting you as the author for the commit, so that your work is credited).

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