[PATCH] D143414: [clang] refactor FileManager::GetUniqueIDMapping

[Richard Howell via Phabricator via cfe-commits]

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Refactor `FileManager::GetUniqueIDMapping` to populate an array of 
`OptionalFileEntryRefDegradesToFileEntryPtr` instead of UID to 
`FileEntry *`. This should allow the path serialization of input files
to use the paths used when looking up a file entry, instead of the 
last reference.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143414

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

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