[llvm] [TSan, SanitizerBinaryMetadata] Improve instrument for derived pointers via phis/selects (PR #132752)

[Marco Elver via llvm-commits]

melver wrote:

> > I'm confused - so this change is superseded by: #132756 ?
> 
> I'm sorry for the confusion caused to you. In fact, it is PR #132756 that needs to use the modified content of this PR. Since I am a novice in submitting a PR, I don't know how to deal with this situation. Therefore, the commit of this PR is also included in that PR (left for the rebase after the PR is merged).

There's a way to do stacked PRs: https://llvm.org/docs/GitHub.html#using-graphite-for-stacked-pull-requests

However, maybe the easier option in this case is to just do the PRs one-by-one.

https://github.com/llvm/llvm-project/pull/132752