[llvm] [InferAlignment] Propagate alignment between loads/stores of the same base pointer (PR #145733)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

It looks like some clang tests need updating.

It also occurred to me that it would be good to check that negative GEP offsets are handled correctly.

https://github.com/llvm/llvm-project/pull/145733