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handling zero length files a little more intelligently. If both files are zero length then we return 0 (true) indicating a match. If only one of the files is zero length then we return 1 (false) indicating that the files differ. If the files don't agree in length then they can't match so we skip the first loop that looks for a quick match. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20200 91177308-0d34-0410-b5e6-96231b3b80d8