- Make Boolean 'true' and 'false' singleton VM isolate objects.

lib/object.cc

 // Copyright (c) 2011, 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/bootstrap_natives.h"
 
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 #include "vm/stack_frame.h"
@@ skipping 76 matching lines @@
     StackFrame* caller_frame = iterator.NextFrame();
     ASSERT(caller_frame != NULL);
     const intptr_t location = caller_frame->GetTokenPos();
     String& malformed_error_message =  String::Handle(
         String::New(malformed_error.ToErrorCString()));
     Exceptions::CreateAndThrowTypeError(
         location, Symbols::Empty(), Symbols::Empty(),
         Symbols::Empty(), malformed_error_message);
     UNREACHABLE();
   }
-  if (negate.value()) {
-    return is_instance_of ? Bool::False() : Bool::True();
-  } else {
-    return is_instance_of ? Bool::True() : Bool::False();
-  }
+  return Bool::Get(negate.value() ? !is_instance_of : is_instance_of);
 }
 
 
 DEFINE_NATIVE_ENTRY(AbstractType_toString, 1) {
   const AbstractType& type =
       AbstractType::CheckedHandle(arguments->NativeArgAt(0));
   return type.UserVisibleName();
 }
 
 }  // namespace dart