r300: remove nir_opt_load_store_vectorize
r300: remove nir_opt_load_store_vectorize
This is another remnant from ntt times, and at this point we have everything as ubo_vec4 so this had zero effect anyway (and there was a bug in the callback function as a bonus, but it got never called luckily).
No shader-db changes.
Fixes the r300 part of #11350