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

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added a reviewer: kadircet.
Herald added subscribers: cfe-commits, usaxena95, arphaman, jkorous, javed.absar.
Herald added a project: clang.

To avoid excessive extra stat()s, only check the possible locations of
headers that weren't found at all (leading to a compile error).
For headers that *were* found, we don't check for files earlier on the
search path that could override them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D77942

Files:
  clang-tools-extra/clangd/unittests/ClangdLSPServerTests.cpp
  clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
  clang/include/clang/Frontend/PrecompiledPreamble.h
  clang/lib/Frontend/PrecompiledPreamble.cpp

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