[llvm] r179456 - Further generalize this scheduler test.

[Tim Northover]

>> The RUN line of this test is missing a '<' between llc and %s which is
>> causing the generated .s file to stick around. Patch attached.
>
> The interleaving of stdout and stderr is nondeterministic. Given that
> the test contains CHECK-NEXT lines, it's probably best not to mix them
> (e.g. replace "2>&1" with "2>1"). Other than that it looks ok to me.

I've committed a variant of this change as r179532.

Tim.