[llvm] BasicAA: Fix assert when indexing address spaces with different sizes (PR #103713)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Aug 14, 6:51 AM EDT**: @arsenm started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/103713).


https://github.com/llvm/llvm-project/pull/103713