[llvm] [Attributor] Change allocation size and load/store offsets using AAPointerInfo for Alloca instructions (PR #72029)

[Johannes Doerfert via llvm-commits]

https://github.com/jdoerfert commented:

My comments have suggestions for additional tests.
There are also some conceptual questions.
We likely want to adjust offsets only late, and deal with inbounds either by not shrinking or by keeping track of them in AAPointerInfo.

https://github.com/llvm/llvm-project/pull/72029