Variable length array of non-POD element type is not valid

src/js/bridge.cpp (NativeClass::staticOperation, NativeClass::constructor): Change invalid variadic arrays to alloca based implementation
src/v8/bridgeV8.cpp (NativeClass::staticOperation, NativeClass::constructor, ProxyObject::message_): Change invalid variadic arrays to alloca based implementation

Because vairable length array of non-POD element type is ill-formed, change invalid variadic arrays to alloca based implementation.
And because alloca memory is not initialized with Any(Undefined) (memory is 0-filled), uninitialized_fill based initialization is also necessary.