KT-14294 for to stdlib to firstOrNull/lastOrNull: intention is absent if there is additional var before for loop

#KT-14294 Fixed

idea/testData/intentions/loopToCallChain/smartCasts/smartCastNotBroken4.kt.after

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+// INTENTION_TEXT: "Replace with 'map{}.map{}.firstOrNull{}'"
+// INTENTION_TEXT_2: "Replace with 'asSequence().map{}.map{}.firstOrNull{}'"
+fun foo(list: List<String>, o: Any) {
+    var result: Any? = ""
+    if (o is CharSequence) {
+        result = list
+                .map { it.length + (o as String).capitalize().hashCode() }
+                .map { it * o.length }
+                .firstOrNull { it > 1000 }
+    }
+}