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60c3154d95b28469f3edb6d28bfa5098b27f7a98
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Author SHA1 Message Date
Jordan Rose
60c3154d95 Add swift::moveFileIfDifferent. 
Equivalent to llvm::sys::fs::rename, except that if the destination file
exists and has the same contents as the source file, the source file is
simply deleted and the destination file is not touched.

Used in next commit.

Swift SVN r28041
 2015-05-01 17:40:28 +00:00