Subj, or on other words, we have a lot of tests that are driven by
the LoopVectorizer's debug output, but we don't have
any meaningful way to autogenerate checklines in them,
which means that an insurmountable amount of manual work
is required when modifying the appropriate cost models.
That is not sustainable, so this presents a solution.
Reviewed By: RKSimon
Differential Revision: https://reviews.llvm.org/D121133
We can't just split by space, that's not going to give us the same
argv we'd have gotten from the shell, it could be in a string,
we must actually parse that as argv.
Roman Lebedev