A pair of optimisations - #157
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`KC(i)` uses `yk_promote` which allows `RKC(i)` to identify optimisation potential that is otherwise missed.
yk's alias analysis doesn't notice this opportunity: by manually expanding things, and making the const-ness explicit, it is noticed.
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This PR contains two optimisations (one very simple, one somewhat more involved) which speed up several benchmarks (and make sieve slightly slower).