Clean up the delimiters test.

Ideally this is a NFCI, used single quotes in most cases. Hopefully
this will make the Windows bot happy.

I've marked this unsupported on windows, until I get my windows box
setup with this patch to test. I'll remove that constraint after I'm
confident this will pass on windows. I just want to silence the
buildbots for now.

llvm-svn: 355007