Fix Object arrays passed to typed Java varargs - #822

Passing an Object[] as the array argument to typed Java varargs currently treats the entire array as one vararg element. Calls such as Class.getDeclaredMethod(..., (Object[]){...}) then try to cast Object[] to the component type instead of converting its elements to the declared array type.

Recognize a non-null Object[] in the fixed-arity position after member selection, convert its elements with the existing coercion rules, and invoke the member with the declared varargs array type. Already typed arrays, null arrays, and expanded varargs keep their existing behavior, while anonymous subclasses apply the same conversion before forwarding arguments to a typed-varargs superclass constructor. Method overload selection remains unchanged.