nir/lower_int64: Fix [iu]mul_high handling
e551040c, which added a new mechanism for 64-bit imul which is more efficient on BDW and later Intel hardware also introduced a bug where we weren't properly walking both X and Y. No idea how testing didn't find this. Fixes: e551040c ("nir/glsl: Add another way of doing lower_imul64 for gen8+" Closes: mesa/mesa#6306 Reviewed-by:Matt Turner <mattst88@gmail.com> Part-of: <mesa/mesa!15829> (cherry picked from commit d0ace287)
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