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

[Vassil Vassilev via cfe-commits]

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vgvassilev wrote:

Looks like you may have just fed my question to ai. However I am asking how removing std::optional at these sports is relevant to the patch in question. 

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