nir: Misc. subgroup lowering improvements
This MR adds three new subgroup lowering flags and improves the handling of subgroup ops on booleans by using b2bN instead of using u2u or i2i on 1-bit types.
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This MR adds three new subgroup lowering flags and improves the handling of subgroup ops on booleans by using b2bN instead of using u2u or i2i on 1-bit types.