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
Edited by Jordan Justen
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Based on patches writted by @rantogno, but rewritten to use a filter callback from nir code.
Cc: @jekstrand, @currojerez