[clang] [clang][NFC] Run `modernize-use-using` check over all the code (PR #149934)

[Nikolas Klauser via cfe-commits]

https://github.com/philnik777 commented:

I agree with @JDevlieghere that this is essentially a large-scale reformatting. I'd definitely reject it if proposed as-is in libc++ (though we do have a lot more `typedef`s in the code base than Clang).

https://github.com/llvm/llvm-project/pull/149934