[PATCH] D142780: [clang] NFCI: Use FileEntryRef in FileManager's UID mapping

[Jan Svoboda via Phabricator via cfe-commits]

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Per the `FileManager` documentation, `VirtualFileEntries` is a subset of `SeenFileEntries`. This means we only have to iterate over the latter to create complete UID mapping. This allows us to map UID to `FileEntryRef` instead of `FileEntry`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142780

Files:
  clang/include/clang/Basic/FileManager.h
  clang/lib/Basic/FileManager.cpp
  clang/lib/Serialization/ASTWriter.cpp

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