Automatically put 'operator' modifier on appropriate Java methods

compiler/testData/loadJava/compiledJava/InnerClassesInGeneric.txt

@@ -9,6 +9,6 @@ public open class InnerClassesInGeneric</*0*/ P : kotlin.Any!, /*1*/ Q : kotlin.
 
     public open inner class Inner2 : test.InnerClassesInGeneric.Inner {
         public constructor Inner2()
-        public open fun iterator(): kotlin.(Mutable)Iterator<P!>!
+        public open operator fun iterator(): kotlin.(Mutable)Iterator<P!>!
     }
 }