Make isolate.h usable without objects-inl.h header.

src/execution.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/execution.h"
 
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
+#include "src/isolate-inl.h"
 #include "src/messages.h"
 #include "src/vm-state-inl.h"
 
 namespace v8 {
 namespace internal {
 
 StackGuard::StackGuard()
     : isolate_(NULL) {
 }
 
@@ skipping 643 matching lines @@
 
   isolate_->counters()->stack_interrupts()->Increment();
   isolate_->counters()->runtime_profiler_ticks()->Increment();
   isolate_->runtime_profiler()->OptimizeNow();
 
   return isolate_->heap()->undefined_value();
 }
 
 }  // namespace internal
 }  // namespace v8