Check if lazy ONE and TWO are needed

[jlapeyre]

I wonder why these are needed:

rsgridsynth/src/diophantine.rs

Lines 119 to 122 in 7cfea4f

	static TWO: Lazy<IBig> = Lazy::new(|| IBig::from(2));
	static ONE: Lazy<IBig> = Lazy::new(|| IBig::ONE);
	if n <= *ONE {

Is it because IBig::ONE looks like a constant, but is actually recomputed when accessed?

If so, there are many more of these in static data, for example in rings.rs that may also benefit
from caching.