[PATCH] D36686: [clang-diff] Add option to compare files across git revisions

[Johannes Altmanninger via Phabricator via cfe-commits]

johannes created this revision.

This adds a command line option "-git-rev=<commit>".
When it is used, only one filename is accepted.  The file in its version
in the specified revision is compared against the current version. Note
that this calls `git checkout` in the current directory.


https://reviews.llvm.org/D36686

Files:
  tools/clang-diff/ClangDiff.cpp

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