[clang] [TBAA] Refine pointer-tbaa for void pointers by pointer depth (PR #126047)

[Bruno De Fraine via cfe-commits]

brunodf-snps wrote:

> I'm not qualified to review this, so please make sure you understand changes to CWG158 test and they are what you expect. Specifically, I'd like to avoid updating the test just to make FileCheck happy.

All the updates to FileCheck patterns match what I expected. The affected test case of cwg158.cpp was added by @fhahn in commit decb87452d8e3b93b21ab9e4c3dd03d85cbebfa5, I hope he will still chime in.

https://github.com/llvm/llvm-project/pull/126047