[llvm-branch-commits] [clang] [Serialization] Code cleanups and polish 83233 (PR #83237)

[Chuanqi Xu via llvm-branch-commits]

ChuanqiXu9 wrote:

@ilya-biryukov hi, the functional and performance test on the root side looks good: https://github.com/root-project/root/pull/14495#issuecomment-1980589145 

Could you try to test this within google internals?

Also if your projects implements new ExternalASTSource, you need to handle that like I did in root: https://github.com/ChuanqiXu9/root/commit/570fd783875671d346c7cdc0d98a8a9afcad05a4

https://github.com/llvm/llvm-project/pull/83237