AddToCollectionTransformation checks that the result collection type cannot be changed

idea/testData/intentions/loopToCallChain/toMutableSet.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+import java.util.HashSet
+
+fun foo(map: Map<Int, String>): MutableCollection<String> {
+    val result = HashSet<String>()
+    <caret>for (s in map.values) {
+        result.add(s)
+    }
+    return result
+}