Generate bridges for fake overrides when needed

#KT-3985 Fixed
 #KT-4145 Fixed

compiler/testData/codegen/box/bridges/substitutionInSuperClass/property.kt

@@ -0,0 +1,12 @@
+open class A<T>(val t: T) {
+    open val foo: T = t
+}
+
+open class B : A<String>("Fail")
+
+class Z : B() {
+    override val foo = "OK"
+}
+
+
+fun box() = (Z() : A<String>).foo