func go/constant.BitLen

3 uses

	go/constant (current package)
		value.go#L635: func BitLen(x Value) int {

	go/types
		expr.go#L112: 	if x.val.Kind() == constant.Int && constant.BitLen(x.val) > prec {
		expr.go#L333: 		switch n := constant.BitLen(x); typ.kind {