Resolve invoke on class objects and enum entries

Added FakeCallableDescriptorForObject to make a resolved call
with object as variable in 'variable as function call'

 #KT-4321 Fixed
 #KT-4863 Fixed

compiler/testData/codegen/box/functions/invoke/onObjects/invokeOnClassObject1.kt

@@ -0,0 +1,8 @@
+class A {
+    class object {
+        fun invoke(i: Int) = i
+    }
+}
+
+fun box() = if (A(42) == 42) "OK" else "fail"
+