Add methods to allow resuming execution after calling TerminateExecution().

src/execution.h

 // Copyright 2011 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 172 matching lines @@
   // it has been set up.
   void ClearThread(const ExecutionAccess& lock);
 
   bool IsStackOverflow();
   bool IsPreempted();
   void Preempt();
   bool IsInterrupted();
   void Interrupt();
   bool IsTerminateExecution();
   void TerminateExecution();
+  void CancelTerminateExecution();
 #ifdef ENABLE_DEBUGGER_SUPPORT
   bool IsDebugBreak();
   void DebugBreak();
   bool IsDebugCommand();
   void DebugCommand();
 #endif
   bool IsGCRequest();
   void RequestGC();
   bool IsFullDeopt();
   void FullDeopt();
@@ skipping 95 matching lines @@
   friend class StackLimitCheck;
   friend class PostponeInterruptsScope;
 
   DISALLOW_COPY_AND_ASSIGN(StackGuard);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXECUTION_H_