Function rotate

bit32.go:31–38

(l *State, i int)

}

func rotate(l *State, i int) int {
	r := trim(CheckUnsigned(l, 1))
	if i &= bitCount - 1; i != 0 {
		r = trim((r << uint(i)) | (r >> uint(bitCount-i)))
	}
	l.PushUnsigned(r)
	return 1
}

func bitOp(l *State, init uint, f func(a, b uint) uint) uint {
	r := init