Speed up function deoptimization by avoiding quadratic pass over optimized function list.

src/deoptimizer.h

 // 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 148 matching lines @@
   // patching. If there is not enough room a new relocation
   // information object is allocated and comments are added until it
   // is big enough.
   static void EnsureRelocSpaceForLazyDeoptimization(Handle<Code> code);
 
   // Deoptimize the function now. Its current optimized code will never be run
   // again and any activations of the optimized code will get deoptimized when
   // execution returns.
   static void DeoptimizeFunction(JSFunction* function);
 
+  // Iterate over all the functions which share the same code object
+  // and make them use unoptimized version.
+  static void ReplaceCodeForRelatedFunctions(JSFunction* function, Code* code);
+
   // Deoptimize all functions in the heap.
   static void DeoptimizeAll();
 
   static void DeoptimizeGlobalObject(JSObject* object);
 
   static void VisitAllOptimizedFunctionsForContext(
       Context* context, OptimizedFunctionVisitor* visitor);
 
   static void VisitAllOptimizedFunctionsForGlobalObject(
       JSObject* object, OptimizedFunctionVisitor* visitor);
@@ skipping 650 matching lines @@
   Object** expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEOPTIMIZER_H_