[Isolates] Avoid dereferencing Isolate::Current() to check oddball identities...

src/prettyprinter.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 496 matching lines @@
 
 void PrettyPrinter::PrintLiteral(Handle<Object> value, bool quote) {
   Object* object = *value;
   if (object->IsString()) {
     String* string = String::cast(object);
     if (quote) Print("\"");
     for (int i = 0; i < string->length(); i++) {
       Print("%c", string->Get(i));
     }
     if (quote) Print("\"");
-  } else if (object == HEAP->null_value()) {
+  } else if (object->IsNull()) {
     Print("null");
-  } else if (object == HEAP->true_value()) {
+  } else if (object->IsTrue()) {
     Print("true");
-  } else if (object == HEAP->false_value()) {
+  } else if (object->IsFalse()) {
     Print("false");
-  } else if (object == HEAP->undefined_value()) {
+  } else if (object->IsUndefined()) {
     Print("undefined");
   } else if (object->IsNumber()) {
     Print("%g", object->Number());
   } else if (object->IsJSObject()) {
     // regular expression
     if (object->IsJSFunction()) {
       Print("JS-Function");
     } else if (object->IsJSArray()) {
       Print("JS-array[%u]", JSArray::cast(object)->length());
     } else if (object->IsJSObject()) {
@@ skipping 978 matching lines @@
     AddAttribute("mode", Variable::Mode2String(decl->mode()));
   }
   Visit(decl->proxy());
   if (decl->fun() != NULL) Visit(decl->fun());
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal