[clang] [clang][NFC] Prefer usings over typedefs (PR #82920)

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https://github.com/NagyDonat approved this pull request.

Personally I feel that the `typedef`s are also OK, but if you prefer `using`, then feel free to switch to using it. (In this particular case I'd agree that the `using` is a bit nicer because it doesn't need the column alignment.)

https://github.com/llvm/llvm-project/pull/82920