Faster `imsersenne`#94

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oscardssmith wants to merge 9 commits intoJuliaMath:mainfrom

oscardssmith:fast-mersenne

Commits on Mar 2, 2021

use linear sieve to dramatically improve runtime of has_small_factor_mersenne
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P-1 isn't worth the effort for practical sizes
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make additions a non-regression for small primes
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Commits on Mar 4, 2021

add test for improvment. Will time out CI if broken, but take no time if working
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use prime that hassmallfactor will catch and fix 32 bit build
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