Method constructor

benchmark/data.js:3–5

(arg)

import { encode } from 'sourcemap-codec';
class BitSet {
	constructor(arg) {
		this.bits = arg instanceof BitSet ? arg.bits.slice() : [];
	}
	add(n2) {
		this.bits[n2 >> 5] |= 1 << (n2 & 31);
	}