KT-14209 for loop to stdlib: sum is not recognized if before was check for type

#KT-14209 Fixed

idea/testData/intentions/loopToCallChain/sum/smartCast.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+// INTENTION_TEXT: "Replace with 'filterIsInstance<>().sum()'"
+// INTENTION_TEXT_2: "Replace with 'asSequence().filterIsInstance<>().sum()'"
+fun foo(list: List<Any>){
+    var result = 0
+    <caret>for (l in list)
+        if (l is Int)
+            result += l
+}