[PATCH] D50926: [SourceManager] Extract 'findFileIDsForFile' from 'translateFile' to allow mapping from one file entry to multiple FileIDs

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.
arphaman added reviewers: jkorous, ioeric.
Herald added a subscriber: dexonsmith.

This patch extracts the code that searches for a file id from `translateFile` to `findFileIDsForFile` to allow the users to map from one file entry to multiple FileIDs.
Will be used as a basis for a clang-rename fix in https://reviews.llvm.org/D50801.


Repository:
  rC Clang

https://reviews.llvm.org/D50926

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

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