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

[Vassil Vassilev via llvm-branch-commits]

vgvassilev wrote:

> The error message looks odd since the language options shouldn't be involved.

Sorry, I did not push. Now you can take a look.

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