Christopher Swenson 424f38f211 Simplification of BigNum::bit_length
As indicated in the comment, the BigNum::bit_length function could be
optimized by using CLZ, which is often a single instruction instead a
loop.

I think the code is also simpler now without the loop.

I added some additional tests for Big8x3 and Big32x40 to ensure that
there were no regressions.
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