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

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alexfh wrote:

Apologies for the delay with the reproducer. @ilya-biryukov is on vacation, but maybe @sam-mccall can help with an isolated test case. Either way it seems to be challenging.

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