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

[via cfe-commits]

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 (unless @ThePhD unchecked the default setting when creating the PR), including forcefully.

For example (you could also use the github CLI, but I'm using vanilla git to demo):
```
git remote add ThePhD https://github.com/ThePhD/llvm-project
git fetch ThePhD
git checkout thephd/embed-speed  # git will tell you you've got this branch, tracking the ThePhD remote
# do changes
git push ThePhD  # add `-f` if you've modified the existing commits, e.g. via rebase
```

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