[clang] [clang-tools-extra] Handle recording inheritance for templates (PR #177273)

[via cfe-commits]

timon-ul wrote:

> In situations like these, I've used [stacked PRs](https://llvm.org/docs//GitHub.html#stacked-pull-requests). (I used the first workflow option described there.)

Yeah this would make sense if I didn't totally screw up the first commit of this PR....I would kinda need to redo the whole history and at that point I think I at least learn a bit if I just port the tests to the type hierarchy (if I get to it quickly enough), and worst case the merge will not be more effort. I mean I expect git to kinda do the right thing already anyway.

https://github.com/llvm/llvm-project/pull/177273