[Preamble] Invalidate preamble when missing headers become present.
Summary: 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. Reviewers: kadircet Subscribers: javed.absar, jkorous, arphaman, usaxena95, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D77942
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