nir: Rename load/store_reg -> load/store_register
This frees up the shorter names for the new register-based intrinsics to be introduced in !23089 (merged). Landing this ahead of !23089 (merged) to keep the conflicts at bay.
This frees up the shorter names for the new register-based intrinsics to be introduced in !23089 (merged). Landing this ahead of !23089 (merged) to keep the conflicts at bay.