[clang] [TBAA] Handle bitfields when generating !tbaa.struct metadata. (PR #82922)

[Florian Hahn via cfe-commits]

fhahn wrote:

> Whitespace is weird in a few places; otherwise looks fine.

Argh yes, should be fixed in the latest version. Still need to figure out how to make sure all changes are formatted once the branch contains merges (before the format checker complains and shows the commits)

https://github.com/llvm/llvm-project/pull/82922