[clang] [NFC] [Sema] [Modules] Use DynamicRecursiveASTVisitor to reduce generted code size (PR #151074)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

I didn't use `function_ref` as it seems not safe to store functions.

https://github.com/llvm/llvm-project/pull/151074