the correct options, places the patch content in order that makes sense for
review, and filters cruft out of the patch (like diffs in *.cvs files). It
produces both a NAME.patch.raw (unfiltered) and NAME.patch (filtered) file.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31850 91177308-0d34-0410-b5e6-96231b3b80d8