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Finds previous power-of-2.
Similar: log2, pow2, isPow2, nextPow2, prevPow2.
prevPow2(x) // x: an int32
const xinteger = require('extra-integer'); xinteger.prevPow2(63); // → 32 xinteger.prevPow2(128); // → 128 xinteger.prevPow2(1); // → 1
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