[llvm] [clang] [Clang][IR] add TBAA metadata on pointer, union and array types. (PR #75177)

[Sam James via cfe-commits]

thesamesam wrote:

> I put union TBAA under the option that is disabled by default. I am also considering to put pointer TBAA under option too, if it raises enough concerns too.

Let's please file a bug once this is merged so we remember to come back to that.

https://github.com/llvm/llvm-project/pull/75177