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

src/x64/deoptimizer-x64.cc

Index: src/x64/deoptimizer-x64.cc
diff --git a/src/x64/deoptimizer-x64.cc b/src/x64/deoptimizer-x64.cc
index 0502502ab00535e42934904898d5348894da0f57..a3fe8f9cf7f6a98b4a96a6c530a48c5d3625dc23 100644
--- a/src/x64/deoptimizer-x64.cc
+++ b/src/x64/deoptimizer-x64.cc
@@ -104,19 +104,7 @@ void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
   // ignore all slots that might have been recorded on it.
   isolate->heap()->mark_compact_collector()->InvalidateCode(code);
 
-  // Iterate over all the functions which share the same code object
-  // and make them use unoptimized version.
-  Context* context = function->context()->native_context();
-  Object* element = context->get(Context::OPTIMIZED_FUNCTIONS_LIST);
-  SharedFunctionInfo* shared = function->shared();
-  while (!element->IsUndefined()) {
-    JSFunction* func = JSFunction::cast(element);
-    // Grab element before code replacement as ReplaceCode alters the list.
-    element = func->next_function_link();
-    if (func->code() == code) {
-      func->ReplaceCode(shared->code());
-    }
-  }
+  ReplaceCodeForRelatedFunctions(function, code);
 
   if (FLAG_trace_deopt) {
     PrintF("[forced deoptimization: ");