feat: field/goldilocks (more efficient 1-limb modulus arith) #177
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This PR adds
field/goldilocks
(q = 0xffffffff00000001) .Mostly tunes the code generation for field arithmetic to produce more efficient code when len(modulus) == 1 limb; no assembly is generated (it would be counter productive) and no "goldilocks" specific tricks are used.
plonky2 paper mentions some "arithmetic tricks" that makes modular reduction efficient. In practice, perf is in the same range than the CIOS Montgomery reduction for 1-liimb.
closes #174