Replace 'class object' with 'default object' in builtins

generators/src/org/jetbrains/kotlin/generators/builtins/numbers.kt

@@ -42,7 +42,7 @@ class GenerateNumbers(out: PrintWriter) : BuiltInsSourceGenerator(out) {
             generateDoc(kind)
             out.println("public class $className private () : Number, Comparable<$className> {")
 
-            out.print("    class object")
+            out.print("    default object")
             if (kind == PrimitiveType.FLOAT || kind == PrimitiveType.DOUBLE) {
                 out.print(" : FloatingPointConstants<$className>")
             }

generators/src/org/jetbrains/kotlin/generators/builtins/ranges.kt

@@ -82,7 +82,7 @@ public class $range(override val start: $t, override val end: $t) : Range<$t>, P
 
     override fun hashCode(): Int $hashCode
 
-    class object {
+    default object {
         /** An empty range of values of type $t. */
         public val EMPTY: $range = $range($emptyBounds)
     }