Compiler misses opportunity to reduce FP ops by computing Polynomial.value and Polynomial.derivative together

[hfutrell]

For newton. Affects projection performance tests.

[hfutrell]

this isn't just an issue for Newton iteration, but cubic and quadratic split(from:,to:) can also benefit from this as they use both the polynomial and its derivative.

there is some evidence that using @inline(__always) here yields benefits.

the approach doesn't just reduce fp ops but also enables SIMD