optimize EliasFanoEncoder::defaultNumLowerBits
Summary: `defaultNumLowerBits` is heavily used during PL encoding with optimally-partitioned EF. This diff improves its performance by 3.5x by avoiding expensive 64-bit division. Reviewed By: ot, luciang Differential Revision: D4564615 fbshipit-source-id: 4521d3c05f19573cd2c84f702fcfeaace5f98e77
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