fix cpu backend: pow, broadcast_pow #2318
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pow implemented as f32/f64 ln and exp works only for positive base. Then intent of this change is to support negative bases as well, and to that end, the current ln+exp code has been removed in favour of stdlib pow functions or accelerated equivalents.
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pow implemented as f32/f64 ln and exp works only for positive base. Then intent of this change is to support negative bases as well, and to that end, the current ln+exp code has been removed in favour of stdlib pow functions or accelerated equivalents.