[PATCH] D134694: Clean up isBeforeInTranslationUnit cache and add eviction.

[Sam McCall via Phabricator via cfe-commits]

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Previously the first 300 entries would stay around forever, and any new queries
would thrash on entry 301.
The cache code/data structures were more complicated than necessary.

Cleaned up the interface to isInSameTranslationUnit, which had unspecified
side-effects that other code was relying on.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134694

Files:
  clang/include/clang/Basic/SourceManager.h
  clang/lib/Basic/SourceManager.cpp

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