[runtime] No need to carry around the creation context for JSBoundFunctions.

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 2553 matching lines @@
     if (name->length() > 0) result = handle(name, isolate);
   }
 
   return result.is_identical_to(isolate->factory()->Object_string())
              ? handle(receiver->class_name())
              : result;
 }
 
 
 Context* JSReceiver::GetCreationContext() {
-  if (IsJSBoundFunction()) {
-    return JSBoundFunction::cast(this)->creation_context();
+  JSReceiver* receiver = this;
+  while (receiver->IsJSBoundFunction()) {
+    receiver = JSBoundFunction::cast(receiver)->bound_target_function();
   }
-  Object* constructor = map()->GetConstructor();
+  Object* constructor = receiver->map()->GetConstructor();
   JSFunction* function;
   if (constructor->IsJSFunction()) {
     function = JSFunction::cast(constructor);
   } else {
     // Functions have null as a constructor,
     // but any JSFunction knows its context immediately.
-    CHECK(IsJSFunction());
-    function = JSFunction::cast(this);
+    CHECK(receiver->IsJSFunction());
+    function = JSFunction::cast(receiver);
   }
 
   return function->context()->native_context();
 }
 
 
 static Handle<Object> WrapType(Handle<HeapType> type) {
   if (type->IsClass()) return Map::WeakCellForMap(type->AsClass()->Map());
   return type;
 }
@@ skipping 17094 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8