[clang] [clang-tools-extra] [Clang] [NFC] Migrate more AST visitors (PR #160290)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

Looking at the benchmarks, are we making everything slower to improve the built times of clang itself? This seems like the wrong trade-off to me

https://github.com/llvm/llvm-project/pull/160290