multiply method
Multiply this by arg.
Implementation
void multiply(Vector4 arg) {
final Float32List argStorage = arg._v4storage;
_v4storage[0] = _v4storage[0] * argStorage[0];
_v4storage[1] = _v4storage[1] * argStorage[1];
_v4storage[2] = _v4storage[2] * argStorage[2];
_v4storage[3] = _v4storage[3] * argStorage[3];
}