Iterate Intention: Filter out functions without 'operator' modifier

idea/testData/intentions/iterateExpression/nonOperatorIterator.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+class T<U> {
+    fun <U> T<U>.iterator(): Iterator<U> = listOf<U>().iterator()
+}
+
+fun test() {
+    T<Int>()<caret>
+}