nir: Rename opt_undef_alu to opt_undef_csel; update comments.
This better reflects what it does. I plan to add other ALU optimizations as well, so the old name would be confusing. In preparation for that, also move the file comments about csels above the opt_undef_csel function, and delete the ones about there not being other optimizations. Signed-off-by: Kenneth Graunke <email@example.com> Reviewed-by: Matt Turner <firstname.lastname@example.org>
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