[PATCH] D45094: [LibTooling] Make interface of VFS injection into ClangTool more user-friendly

[Whisperity via Phabricator via cfe-commits]

whisperity updated this revision to Diff 141204.
whisperity added a comment.

- Use an even more explicit way with the documentation requiring that the file system should be an overlay.
- Add a method to easily overlay a `FileSystem` above the real one.


Repository:
  rC Clang

https://reviews.llvm.org/D45094

Files:
  include/clang/Basic/VirtualFileSystem.h
  include/clang/Tooling/Tooling.h
  lib/Basic/VirtualFileSystem.cpp
  lib/Tooling/Tooling.cpp
  unittests/Tooling/ToolingTest.cpp

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