[compiler] Decouple ToObject from CreateWithContext.

src/runtime/runtime-scopes.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/frames-inl.h"
 #include "src/isolate-inl.h"
@@ skipping 688 matching lines @@
 
   DCHECK(function->context() == isolate->context());
   int length = function->shared()->scope_info()->ContextLength();
   return *isolate->factory()->NewFunctionContext(length, function);
 }
 
 
 RUNTIME_FUNCTION(Runtime_PushWithContext) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, extension_object, 0);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 1);
-  Handle<JSReceiver> extension_object;
-  if (!Object::ToObject(isolate, value).ToHandle(&extension_object)) {
-    THROW_NEW_ERROR_RETURN_FAILURE(
-        isolate, NewTypeError(MessageTemplate::kUndefinedOrNullToObject));
-  }
   Handle<Context> current(isolate->context());
   Handle<Context> context =
       isolate->factory()->NewWithContext(function, current, extension_object);
   isolate->set_context(*context);
   return *context;
 }
 
 
 RUNTIME_FUNCTION(Runtime_PushCatchContext) {
   HandleScope scope(isolate);
@@ skipping 407 matching lines @@
 
   // Lookup in the initial Object.prototype object.
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
       Object::GetProperty(isolate->initial_object_prototype(), key));
   return *result;
 }
 }  // namespace internal
 }  // namespace v8