Install the 'name' property in classes at runtime

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index cdbc6fe04dbf8f4fcbe5cee231017e8c56245046..7d07e4342adeb7379b433c6797b4d0793ee3c174 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -2654,6 +2654,43 @@ void Factory::SetStrictFunctionInstanceDescriptor(Handle<Map> map,
   }
 }
 
+Handle<Map> Factory::CreateClassFunctionMap(Handle<JSFunction> empty_function) {
+  Handle<Map> map = NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
+  SetClassFunctionInstanceDescriptor(map);
+  map->set_is_constructor(true);
+  map->set_is_callable();
+  Map::SetPrototype(map, empty_function);
+  return map;
+}
+
+void Factory::SetClassFunctionInstanceDescriptor(Handle<Map> map) {
+  int size = 3;  // with prototype
+  Map::EnsureDescriptorSlack(map, size);
+
+  PropertyAttributes rw_attribs =
+      static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
+  PropertyAttributes roc_attribs =
+      static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
+
+  STATIC_ASSERT(JSFunction::kLengthDescriptorIndex == 0);
+  {  // Add length.
+    Handle<AccessorInfo> length =
+        Accessors::FunctionLengthInfo(isolate(), roc_attribs);
+    AccessorConstantDescriptor d(handle(Name::cast(length->name())), length,
+                                 roc_attribs);
+    map->AppendDescriptor(&d);
+  }
+
+  {
+    // Add prototype.
+    Handle<AccessorInfo> prototype =
+        Accessors::FunctionPrototypeInfo(isolate(), rw_attribs);
+    AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
+                                 prototype, rw_attribs);
+    map->AppendDescriptor(&d);
+  }
+}
+
 Handle<JSFixedArrayIterator> Factory::NewJSFixedArrayIterator(
     Handle<FixedArray> array) {
   // Create the "next" function (must be unique per iterator object).