New J2K: implement mutability inference in post-processing

#KT-24293 fixed
#KT-19603 fixed

nj2k/testData/newJ2k/mutableCollections/mutableListInOtherClass.kt

@@ -0,0 +1,11 @@
+import java.util.ArrayList
+
+class Owner {
+    var list: MutableList<String> = ArrayList()
+}
+
+class Updater {
+    fun update(owner: Owner) {
+        owner.list.add("")
+    }
+}