Update checks in advance of an update to D68233.

In the past, the IR Verifier would bail out at the first broken function
it found. This required trickery with sed to put multiple broken functions
in a single test file.

Now, the Verifier allows for multiple broken functions. The sed trickery
is no longer needed. I've eliminated it.

I've also split the test into two since one of them passes verification
and we need to look at the output IR from 'opt'. The other fails and we
need to look at the diagnostics printed by the Verifier.