Make assertion scopes thread safe.

src/execution.cc

 // Copyright 2012 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 89 matching lines @@
   }
 
   // Make sure that the global object of the context we're about to
   // make the current one is indeed a global object.
   ASSERT(function->context()->global_object()->IsGlobalObject());
 
   {
     // Save and restore context around invocation and block the
     // allocation of handles without explicit handle scopes.
     SaveContext save(isolate);
-    NoHandleAllocation na(isolate);
+    SealHandleScope shs(isolate);
     JSEntryFunction stub_entry = FUNCTION_CAST<JSEntryFunction>(code->entry());
 
     // Call the function through the right JS entry stub.
     byte* function_entry = function->code()->entry();
     JSFunction* func = *function;
     Object* recv = *receiver;
     Object*** argv = reinterpret_cast<Object***>(args);
     value =
         CALL_GENERATED_CODE(stub_entry, function_entry, func, recv, argc, argv);
   }
@@ skipping 800 matching lines @@
   }
   if (stack_guard->IsFullDeopt()) {
     stack_guard->Continue(FULL_DEOPT);
     Deoptimizer::DeoptimizeAll(isolate);
   }
   return isolate->heap()->undefined_value();
 }
 
 
 } }  // namespace v8::internal