intel: Lower tg4 source offsets in some cases on gfx12.5+
Based on patches writted by @rantogno, but rewritten to use a filter callback from nir code.
Cc: @jekstrand, @currojerez
Based on patches writted by @rantogno, but rewritten to use a filter callback from nir code.
Cc: @jekstrand, @currojerez