For multipart tests, place the parts with no

For multipart tests, place the parts with no
RUN line in Support.  Give up on sending output
to /dev/null - this cannot always be arranged.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40436 91177308-0d34-0410-b5e6-96231b3b80d8