[llvm] [SDAG] Use BatchAAResults for querying alias analysis (AA) results (PR #123934)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> A possible followup here would be to add a PM-level BatchAA analysis for backend use. Then it can be shared across all the SDAG/MIR backend passes.

I'll look into this when I have some spare time :+1: 

https://github.com/llvm/llvm-project/pull/123934