Treat ExecutableAccessorInfo as regular data properties.

src/accessors.cc

Index: src/accessors.cc
diff --git a/src/accessors.cc b/src/accessors.cc
index 6ade56aaee7ad3d1eb09240194b44d4d5e7d3da7..eb7e372851ae8c4a377c696066beee59bc0c5e4b 100644
--- a/src/accessors.cc
+++ b/src/accessors.cc
@@ -191,16 +191,7 @@ void Accessors::ArrayLengthSetter(
   Handle<JSObject> object = Handle<JSObject>::cast(
       Utils::OpenHandle(*info.This()));
   Handle<Object> value = Utils::OpenHandle(*val);
-  // This means one of the object's prototypes is a JSArray and the
-  // object does not have a 'length' property.  Calling SetProperty
-  // causes an infinite loop.
-  if (!object->IsJSArray()) {
-    MaybeHandle<Object> maybe_result =
-        JSObject::SetOwnPropertyIgnoreAttributes(
-            object, isolate->factory()->length_string(), value, NONE);
-    maybe_result.Check();
-    return;
-  }
+  ASSERT(object->IsJSArray());
 
   value = FlattenNumber(isolate, value);
 
@@ -871,13 +862,7 @@ static Handle<Object> SetFunctionPrototype(Isolate* isolate,
     function = Handle<JSFunction>(function_raw, isolate);
   }
 
-  if (!function->should_have_prototype()) {
-    // Since we hit this accessor, object will have no prototype property.
-    MaybeHandle<Object> maybe_result =
-        JSObject::SetOwnPropertyIgnoreAttributes(
-            receiver, isolate->factory()->prototype_string(), value, NONE);
-    return maybe_result.ToHandleChecked();
-  }
+  ASSERT(function->should_have_prototype());
 
   Handle<Object> old_value;
   bool is_observed = *function == *receiver && function->map()->is_observed();