[PATCH] D55085: Avoid emitting redundant or unusable directories in DIFile metadata entries

[Adrian Prantl via Phabricator via cfe-commits]

aprantl added a comment.

Adding a few more reviewers since I'm touching the backend diagnostics. The backend change is supposed to be NFC, but it never hurts to have more feedback.


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  https://reviews.llvm.org/D55085/new/

https://reviews.llvm.org/D55085