[es6] Initial steps towards a correct implementation of IsCallable.

src/runtime/runtime-proxy.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/arguments.h"
 #include "src/factory.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_CreateJSProxy) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, handler, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
   if (!prototype->IsJSReceiver()) prototype = isolate->factory()->null_value();
   return *isolate->factory()->NewJSProxy(handler, prototype);
 }
 
 
 RUNTIME_FUNCTION(Runtime_CreateJSFunctionProxy) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 4);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, handler, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, call_trap, 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, call_trap, 1);
   RUNTIME_ASSERT(call_trap->IsJSFunction() || call_trap->IsJSFunctionProxy());
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, construct_trap, 2);
   CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 3);
   if (!prototype->IsJSReceiver()) prototype = isolate->factory()->null_value();
   return *isolate->factory()->NewJSFunctionProxy(handler, call_trap,
                                                  construct_trap, prototype);
 }
 
 
 RUNTIME_FUNCTION(Runtime_IsJSProxy) {
@@ skipping 38 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_Fix) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSProxy, proxy, 0);
   JSProxy::Fix(proxy);
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8