Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

src/objects.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
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   // Tells whether this function is builtin.
   inline bool IsBuiltin();
 
   // Tells whether or not the function needs arguments adaption.
   inline bool NeedsArgumentsAdaption();
 
   // Tells whether or not this function has been optimized.
   inline bool IsOptimized();
 
+  // Tells whether or not this function can be optimized.
+  inline bool IsOptimizable();
+
   // Mark this function for lazy recompilation. The function will be
   // recompiled the next time it is executed.
   void MarkForLazyRecompilation();
 
   // Tells whether or not the function is already marked for lazy
   // recompilation.
   inline bool IsMarkedForLazyRecompilation();
 
   // Compute a hash code for the source code of this function.
   uint32_t SourceHash();
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     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_