Extract Superclass: Report private members used in abstracted members

#KT-16284 Fixed

idea/testData/refactoring/pullUp/k2k/privateMemberWithUsagesToInterface.kt.after

@@ -0,0 +1,9 @@
+interface I {
+    // INFO: {checked: "true"}
+    fun privateFun() = 0
+}
+
+class Foo : I {
+
+    fun refer() = privateFun()
+}