[clang] [Serialization] No transitive identifier change (PR #92085)

[Jan Svoboda via cfe-commits]

https://github.com/jansvoboda11 approved this pull request.

LGTM, but I think it would be better to split out the `LazyIdentifierInfoPtr` change into a separate commit.

https://github.com/llvm/llvm-project/pull/92085