nir: add option to lower slt/sge/seq/sne

In freedreno these get implemented as the matching f* instruction plus a
u2f to convert the result to float 1.0/0.0.  But less lines of code to
just let nir_opt_algebraic handle this for us, plus opens up some small
window for other opt passes to improve (ie. if some shader ended up with
both a flt and slt with same src args, for example).

v2: use b2f rather than u2f

Signed-off-by: Rob Clark <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Matt Turner <[email protected]>

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