Overridden function is not being called when sublassing generic class in Release Build with Whole Module Optimization. https://bugs.swift.org/browse/SR-1117

SR-1117.swift

/// A generic class
class Parent<T> {

    func printName() {
        print(self.name())
    }

    func name() -> String {
        return "Parent"
    }

}

/// Subclass of generic class
class Child: Parent<String> {

    /// This method is not being called with Release Build + Whole Module Optimization.
    override func name() -> String {
        return "Child"
    }

}

let child = Child()
child.printName() // expected "Child" but prints "Parent" with Release Build + Whole Module Optimization.