VM [KERNEL] Use simpleInstanceOf in kernel.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 16660 matching lines @@
 const char* AbstractType::ToCString() const {
   if (IsNull()) {
     return "AbstractType: null";
   }
   // AbstractType is an abstract class.
   UNREACHABLE();
   return "AbstractType";
 }
 
 
+bool simpleInstanceOfType(const AbstractType& type) {
+  // Bail if the type is still uninstantiated at compile time.
+  if (!type.IsInstantiated()) return false;
+
+  // Bail if the type is a function or a Dart Function type.
+  if (type.IsFunctionType() || type.IsDartFunctionType()) return false;
+
+  ASSERT(type.HasResolvedTypeClass());
+  const Class& type_class = Class::Handle(type.type_class());
+  // Bail if the type has any type parameters.
+  if (type_class.IsGeneric()) return false;
+
+  // Finally a simple class for instance of checking.
+  return true;
+}
+
+
 RawType* Type::NullType() {
   return Isolate::Current()->object_store()->null_type();
 }
 
 
 RawType* Type::DynamicType() {
   return Object::dynamic_type().raw();
 }
 
 
@@ skipping 6440 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart