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Commit 2878e965 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith Committed by Duncan P. N. Exon Smith
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Basic: Add hashing support for FileEntryRef and DirectoryEntryRef 

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

Also add `DirectoryEntryRef::isSameRef` to simplify the implementation
and facilitate testing.

Differential Revision: https://reviews.llvm.org/D92627
parent 66a03d10
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