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Commit ac40a2d8 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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Serialization: Change InputFile to use FileEntryRef and add getVirtualFileRef, NFC 

Change the `InputFile` class to store `Optional<FileEntryRef>` instead
of `FileEntry*`. This paged in a few API changes:

- Added `FileManager::getVirtualFileRef`, and converted `getVirtualFile`
  to a wrapper of it.
- Updated `SourceManager::bypassFileContentsOverride` to take
  `FileEntryRef` and return `Optional<FileEntryRef>`
  (`ASTReader::getInputFile` is the only caller).

Differential Revision: https://reviews.llvm.org/D90053
parent 9615890d
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