[llvm] [AMDGPU] Add target feature require-naturally-aligned-buffer-access (PR #115479)

[Piotr Sobczak via llvm-commits]

piotrAMD wrote:

> This needs codegen tests. I would expect this to touch addressing mode matching. I don't believe this is sufficient for correct handling, and will only partially avoid introducing new violations

Right, the current patch already fixes the CTS issue I came across, but as you say, there might be more places that need fixing. I will take a look and at least will add an extra test.

https://github.com/llvm/llvm-project/pull/115479