Write our JS blobs for handling native classes in Dart.

frog/leg/ssa/codegen.dart

 // Copyright (c) 2012, 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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   SsaCodeGeneratorTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA code generator';
 
   String generate(WorkItem work, HGraph graph) {
     return measure(() {
@@ skipping 1159 matching lines @@
     if (element.computeType(compiler) is FunctionType) return false;
 
     if (!element.isClass()) {
       compiler.cancel("Is check does not handle element", element: element);
       return false;
     }
 
     List<ClassElement> subtypes =
         compiler.emitter.nativeEmitter.subtypes[element];
     if (subtypes === null) return false;
+    compiler.registerStaticUse(compiler.findHelper(
+        const SourceString('dynamicIsCheck')));
     return true;
   }
 }
 
 class SsaOptimizedCodeGenerator extends SsaCodeGenerator {
   final List<HTypeGuard> guards;
   int state = 0;
 
   SsaOptimizedCodeGenerator(compiler, work, parameters, parameterNames)
     : super(compiler, work, parameters, parameterNames),
@@ skipping 336 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endElse(HIf node) {
     if (node.elseBlock.hasBailouts()) {
       endBailoutSwitch();
     }
   }
 }