Declaration order dependency for interfaces

[Alfred Theorin]

Interface attributes declared before the interface itself give errors:

aspect InterfaceOrder {
    syn int MyInterface.myValue1() = 10; // Error

    public interface MyInterface {
    }

    syn int MyInterface.myValue2() = 10; // OK
}

Used JastAdd version: 2.1.10

[Jesper Öqvist]

Fixed syn attribute declaration order dependence

Delay weaving of synthesized attributes to fix a declaration order dependence.

fixes #194 (bitbucket)

→ <<cset 6c0b432eaf48>>