Add small optimizations for QuantizeLinear #532
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Optimize QuantizeLinear and DynamicQuantizeLinear by replacing divisions with multiplication by a pre-computed reciprocal.
Rust's `as` operator already does the desired saturating cast when converting from f32 -> i8 / u8.
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Add a couple of small and easy optimizations to QuantizeLinear. This also benefits DynamicQuantizeLinear.
clamp-ing as Rust'sasoperator does this for usThis is ~15% faster in a test with ModernBERT. It should be possible to do much better with SIMD, but that will come later.