[clang] [Sema, Lex, Parse] Preprocessor embed in C and C++ (and Obj-C and Obj-C++ by-proxy) (PR #68620)

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h-vetinari wrote:

> > Because I don't know of any better way to commandeer a patch in GitHub
> 
> As a maintainer, you can push into this branch

I had reached out to @ThePhD with an offer to help on this before they opened this PR, and I now have push access to their fork, which means I could change the state of this PR.

To be clear, I cannot offer to defend the content (semantically) in the face of review, but - if desired - I'd be happy to help with some more routine operations like rebasing, formatting, or chopping off pieces into separate PRs (all while keeping @ThePhD's authorship, of course).

https://github.com/llvm/llvm-project/pull/68620