Fixed some cases when smart cast problems were not detected

idea/testData/intentions/loopToCallChain/smartCastNotBroken2.kt.after

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+// INTENTION_TEXT: "Replace with 'map{}.map{}.firstOrNull{}'"
+fun foo(list: List<String>, o: Any): Int? {
+    if (o is CharSequence) {
+        <caret>return list
+                .map { it.length + (o as String).capitalize().hashCode() }
+                .map { it * o.length }
+                .firstOrNull { it > 1000 }
+    }
+    return 0
+}

idea/testData/intentions/loopToCallChain/smartCastNotBroken2.kt.todo

@@ -0,0 +1,13 @@
+// WITH_RUNTIME
+// INTENTION_TEXT: "Replace with 'map{}.map{}.firstOrNull{}'"
+fun foo(list: List<String>, o: Any): Int? {
+    if (o is CharSequence) {
+        <caret>for (s in list) {
+            val a = s.length + (o as String).capitalize().hashCode()
+            val x = a * o.length
+            if (x > 1000) return x
+        }
+        return null
+    }
+    return 0
+}

idea/testData/intentions/loopToCallChain/smartCastRequired3.kt

@@ -0,0 +1,12 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+fun foo(list: List<Any>): String? {
+    <caret>for (o in list) {
+        if (bar(o as String)) {
+            return o
+        }
+    }
+    return null
+}
+
+fun bar(s: String): Boolean = true

idea/testData/intentions/loopToCallChain/smartCastRequired4.kt

@@ -0,0 +1,14 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+fun foo(list: List<Any>): String? {
+    var v: String? = null
+    <caret>for (o in list) {
+        if (bar(o as String)) {
+            v = o
+            break
+        }
+    }
+    return v
+}
+
+fun bar(s: String): Boolean = true

idea/testData/intentions/loopToCallChain/smartCastRequired5.kt

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+fun foo(list: List<Any>, target: MutableCollection<String>) {
+    <caret>for (o in list) {
+        if (bar(o as String)) {
+            target.add(o)
+        }
+    }
+}
+
+fun bar(s: String): Boolean = true