[ValueTracking] Add more tests for alignment assume bundles

I noticed that alignment was no longer inferred as well after I last merged
our CHERI fork from upstream. I opened this review before seeing that D88669
already fixes the same problem, so this commit simply adds the new test that
I added as part of this change.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D89830