[PATCH] D77942: [Preamble] Invalidate preamble when missing headers become present.

[Sam McCall via Phabricator via cfe-commits]

sammccall added a comment.

At first I thought this would be easy to test via clang/test/PCH, but the outer layers of PrecompiledPreamble seem to be totally distinct from PCHGenerator etc. This is only used in ASTUnit and clangd.
Maybe it's reachable in libclang but I couldn't easily work out how.


Repository:
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https://reviews.llvm.org/D77942