test: split test into two runs

Rather than checking both stdout and stderr simultaneously, split it into two
tests.  This apparently breaks on Windows where MSVCRT does not buffer output
correctly.  NFC.

Thanks to chapuni for bringing the issue to my attention!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267179 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed