Implement modular compilation

tool/input_sdk/private/ddc_runtime/rtti.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This library defines the association between runtime objects and
 /// runtime types.
 part of dart._runtime;
 
 ///
 /// Runtime type information.  This module defines the mapping from
@@ skipping 48 matching lines @@
   let t;
   if ($args.length == 0) {
     // No type arguments, it's all dynamic
     t = $definiteFunctionType(
       $dynamicR, Array($closure.length).fill($dynamicR));
   } else {
     // We're passed the piecewise components of the function type,
     // construct it.
     t = $definiteFunctionType.apply(null, $args);
   }
-  tag($closure, t);
+  $tag($closure, t);
   return $closure;
 })()''');
 
 // TODO(vsm): How should we encode the runtime type?
 final _runtimeType = JS('', 'Symbol("_runtimeType")');
 
 checkPrimitiveType(obj) => JS('', '''(() => {
   switch (typeof $obj) {
     case "undefined":
       return $Null;
@@ skipping 87 matching lines @@
 tagMemoized(value, compute) => JS('', '''(() => {
   let cache = null;
   function getter() {
     if ($compute == null) return cache;
     cache = $compute();
     $compute = null;
     return cache;
   }
   $tagComputed($value, getter);
 })()''');