GlobalISel: Regen vector mir tests, add tests for vector arg lowering

Precommit for D114198 (Rework more/fewer elements for vectors).
Regenerate auto-generated mir tests for vectors (use CHECK-NEXT instead
of CHECK). Remove -global-isel-abort=0 where it is no longer needed.
Add mir tests for different AMDGPU sub-targets and they way they lower
function vector arguments (tests for legalization artifact combiner).