Retry submitting r186623: COFFDumper: Dump data directory entries.

The original change was rolled back in r186627 because of test
failures on the big endian machine. I believe I fixed the issue
so re-submitting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186734 91177308-0d34-0410-b5e6-96231b3b80d8