Merge a number of assertion failure fixes to the 3.0 branch.

src/api.cc

 // Copyright 2010 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 97 matching lines @@
 static i::HandleScopeImplementer thread_local;
 
 
 // --- E x c e p t i o n   B e h a v i o r ---
 
 
 static FatalErrorCallback exception_behavior = NULL;
 
 static void DefaultFatalErrorHandler(const char* location,
                                      const char* message) {
-  ENTER_V8;
+#ifdef ENABLE_VMSTATE_TRACKING
+  i::VMState __state__(i::OTHER);
+#endif
   API_Fatal(location, message);
 }
 
 
 static FatalErrorCallback& GetFatalErrorHandler() {
   if (exception_behavior == NULL) {
     exception_behavior = DefaultFatalErrorHandler;
   }
   return exception_behavior;
 }
@@ skipping 5031 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal