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

src/deoptimizer.h

Index: src/deoptimizer.h
diff --git a/src/deoptimizer.h b/src/deoptimizer.h
index 199575496780a8b24e67bb2bccf93c29631e9bf5..f67f986ba1b13467517265619a1f512801904f64 100644
--- a/src/deoptimizer.h
+++ b/src/deoptimizer.h
@@ -166,6 +166,10 @@ class Deoptimizer : public Malloced {
   // 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();