[X86][AVX] Regenerate PSUBUS tests for slow/fast shuffle AVX2 targets

update_llc_test_checks.py isn't reporting when we don't have a usable prefix for a particular run any more - so we lost all AVX2 testing!

GitOrigin-RevId: f32dc6bb42fd24517289fd1e3418994daa4fec20
1 file changed