The previous reciprocal division branch on the prime that the sizeclass
was constructed from. All sizeclasses can be represented as
2^n * {1,3,5,7}
This lead to a very small table, but some work to calculate the
appropriate shifts and multiplications to implement reciprocal division.
This commit uses a completely uniform representation for every
sizeclass using a lookup table. Due to the precise ranges that we query
the modulus and rounding on, we can do this much more efficiently.
The func-release-rounding exhaustively tests all the queries we are
interested in.
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