Add toString() to Any, fix all tests

#KT-4517 Fixed

js/js.libraries/src/core/javalang.kt

@@ -51,5 +51,5 @@ public class StringBuilder() : Appendable {
     //TODO
     //override fun append(csq: CharSequence?, start: Int, end: Int): StringBuilder = js.noImpl
     public fun append(obj: Any?): StringBuilder = js.noImpl
-    public fun toString(): String = js.noImpl
+    override fun toString(): String = js.noImpl
 }

js/js.libraries/src/core/javautil.kt

@@ -49,7 +49,7 @@ public abstract class AbstractList<E>() : AbstractCollection<E>(), MutableList<E
 
     override fun equals(other: Any?): Boolean = js.noImpl
 
-    fun toString(): String = js.noImpl
+    override fun toString(): String = js.noImpl
 }
 
 library

js/js.libraries/src/stdlib/TuplesCode.kt

@@ -8,8 +8,7 @@ public class Pair<A, B> (
     public fun component1(): A = first
     public fun component2(): B = second
 
-    public fun toString(): String = "($first, $second)"
-
+    override fun toString(): String = "($first, $second)"
 }
 
 public class Triple<A, B, C> (
@@ -21,5 +20,5 @@ public class Triple<A, B, C> (
     public fun component2(): B = second
     public fun component3(): C = third
 
-    public fun toString(): String = "($first, $second, $third)"
+    override fun toString(): String = "($first, $second, $third)"
 }