ir3: Emit barriers for images again
This was accidentally broken with the nir_var_image work.
Fixes: e87dbfd3 ("ir3: Check for nir_var_mem_image in shared_barrier handling")
This was accidentally broken with the nir_var_image work.
Fixes: e87dbfd3 ("ir3: Check for nir_var_mem_image in shared_barrier handling")