Added navigation to source of constructor.

#KT-3168 fixed

idea/testData/libraries/usercode/Constructor.kt

@@ -0,0 +1,6 @@
+import testData.libraries.*
+
+val x: ClassWithConstructor = ClassWithConstructor("abc", 239)
+
+// main.kt
+//public class <1><2>ClassWithConstructor(val a: String, b: Any)

idea/testData/libraries/usercode/ExtensionProperty.kt

@@ -17,6 +17,6 @@ fun foo() {
 //    return this
 //}
 //
-//public class Pair<A, B>(val first: A, val second: B)
+//public class <2>Pair<A, B>(val first: A, val second: B)
 //
-//public val <T> Pair<T, T>.<2>exProp : String
+//public val <T> Pair<T, T>.<3>exProp : String