Unwrap fake override of original

This fixes a couple of verify errors related to the order of supertypes in the
class declaration

compiler/testData/codegen/box/fakeOverride/propertyGetter.kt

@@ -0,0 +1,37 @@
+trait T {
+    val foo: String
+}
+
+open class A : T {
+    override val foo: String = ""
+}
+
+class B : A(), T
+class C : T, A()
+
+trait U : T
+
+class D : U, A()
+class E : A(), U
+class F : U, T, A()
+class G : T, U, A()
+class H : U, A(), T
+class I : T, A(), U
+class J : A(), U, T
+class K : A(), T, U
+
+fun box(): String {
+    B().foo
+    C().foo
+
+    D().foo
+    E().foo
+    F().foo
+    G().foo
+    H().foo
+    I().foo
+    J().foo
+    K().foo
+
+    return "OK"
+}