Jonas Devlieghere efe21088d7 [VFS] Add reverse iterator to OverlayFileSystem ...

Add a reverse iterator to the overlay file system. This makes it
possible to take overlays from one OverlayFileSystem, and add them to
another.

Differential revision: https://reviews.llvm.org/D64113

llvm-svn: 364986

2019-07-03 00:45:53 +00:00

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