[llvm] Attributor: Infer noalias.addrspace metadata for memory instructions (PR #136553)

[Shilei Tian via llvm-commits]

https://github.com/shiltian approved this pull request.

I'm not really a fan of the `getMaxAddrSpace` design, but I don’t have a better alternative in mind at the moment either.

https://github.com/llvm/llvm-project/pull/136553