[FIR2IR] Properly calculate dispatch receiver type for fake overrides

If some function is not fake-override, then its type should be just
  default type of containing class
For fake overrides the default type calculated in the following way:
1. Find first overridden function, which is not fake override
2. Take its containing class
3. Find supertype of current containing class with type constructor of
   class from step 2

^KT-60252 Fixed

compiler/testData/ir/irText/classes/fakeOverridesForAnyMembers.kt

@@ -0,0 +1,10 @@
+// FIR_IDENTICAL
+open class A<A_T>
+
+open class B<B_T> : A<B_T>() {
+    override fun hashCode(): Int = 0
+}
+
+open class C<C_T> : B<C_T>()
+
+open class D<D_T> : C<D_T>()