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Make sure to remove the unique lock file, which is what the .lock symlink points to, if there is a signal while the lock is held. This will release the lock, since the symlink will point to nothing (already tested in unit tests). For good measure, also clean up the unique lock file if there is an error or signal before the lock is acquired. I will add a clang test. rdar://problem/21512307 llvm-svn: 240967