[clang] [Sema] Skip ExternalSource query and clear DeleteExprs in incremental mode (PR #192856)

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lucasvallejoo wrote:

Hi Vassil, sorry for the confusion in my previous reply, I didn't realize you were commenting on a specific line and misread your question.
Those std::optional changes were in my local tree unintentionally and are not part of this patch. I've cleaned up the branch and force-pushed. The PR now only contains the intended changes to ActOnEndOfTranslationUnit and the regression test. Let me know if you have any further questions.

https://github.com/llvm/llvm-project/pull/192856