VM [KERNEL] Use simpleInstanceOf in kernel.

runtime/vm/kernel_to_il.cc

 // Copyright (c) 2016, 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.
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "vm/kernel_to_il.h"
 
@@ skipping 5035 matching lines @@
   if (type.IsInstantiated() &&
       object_type.IsSubtypeOf(type, NULL, NULL, Heap::kOld)) {
     // Evaluate the expression on the left but ignore it's result.
     instructions += Drop();
 
     // Let condition be always true.
     instructions += Constant(Bool::True());
   } else {
     instructions += PushArgument();
 
+    // See if simple instanceOf is applicable.
+    if (simpleInstanceOfType(type)) {
+      instructions += Constant(type);
+      instructions += PushArgument();  // Type.
+      instructions += InstanceCall(
+          node->position(),
+          dart::Library::PrivateCoreLibName(Symbols::_simpleInstanceOf()),
+          Token::kIS, 2, 2);  // 2 checked arguments.
+      fragment_ = instructions;
+      return;
+    }
+
     if (!type.IsInstantiated()) {
       instructions += LoadInstantiatorTypeArguments();
     } else {
       instructions += NullConstant();
     }
     instructions += PushArgument();  // Type arguments.
 
     instructions += Constant(type);
     instructions += PushArgument();  // Type.
 
@@ skipping 1409 matching lines @@
     thread->clear_sticky_error();
     return error.raw();
   }
 }
 
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)