[llvm] r179456 - Further generalize this scheduler test.

[Tim Northover]

Hi Jordy,

> 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.

Tim.