[llvm] [DA] disambiguate evolution of base addresses (PR #116628)

[Sebastian Pop via llvm-commits]

sebpop wrote:

I see 2 extra errors when using BatchAA in cross iter mode:
```
  LLVM :: Analysis/DependenceAnalysis/AA.ll
  LLVM :: Analysis/DependenceAnalysis/NonAffineExpr.ll
```
Both fails are in https://github.com/llvm/llvm-project/blob/main/llvm/lib/Analysis/BasicAliasAnalysis.cpp#L1620 where the dyn_cast<Instruction> fails for some reason on a LoadInst.
@nikic could you please have a look? It's in the patch you pointed out above.

https://github.com/llvm/llvm-project/pull/116628