[PATCH] D92627: Basic: Add hashing support for FileEntryRef and DirectoryEntryRef

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.
dexonsmith added reviewers: arphaman, JDevlieghere, jansvoboda11.
Herald added a subscriber: ributzka.
dexonsmith requested review of this revision.
Herald added a project: clang.

Allow hashing FileEntryRef and DirectoryEntryRef via `hash_value`, and
use that to implement `DenseMapInfo`. This hash be equal whenever the
entry is the same (the name used to reference it is not relevant).

Also added `DirectoryEntryRef::isSameRef` as a drive-by to facilitate
testing.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92627

Files:
  clang/include/clang/Basic/DirectoryEntry.h
  clang/include/clang/Basic/FileEntry.h
  clang/unittests/Basic/FileEntryTest.cpp

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