V8 support for cached accessors.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 996aafa9f61dcdaf7789666549be3480326adbb9..707a2cbe004c3b5ce051c880e0acd50efb187a1e 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1362,6 +1362,11 @@ MaybeHandle<Object> Object::GetPropertyWithAccessor(LookupIterator* it) {
     return reboxed_result;
   }
 
+  // AccessorPair with 'cached' private property.
+  if (it->TryLookupCachedProperty()) {
+    return Object::GetProperty(it);
+  }
+
   // Regular accessor.
   Handle<Object> getter(AccessorPair::cast(*structure)->getter(), isolate);
   if (getter->IsFunctionTemplateInfo()) {
@@ -20269,5 +20274,18 @@ Handle<JSModuleNamespace> Module::GetModuleNamespace(Handle<Module> module) {
   return ns;
 }
 
+MaybeHandle<Name> FunctionTemplateInfo::TryGetCachedPropertyName(
+    Isolate* isolate, Handle<Object> getter) {
+  if (getter->IsFunctionTemplateInfo()) {
+    Handle<FunctionTemplateInfo> fti =
+        Handle<FunctionTemplateInfo>::cast(getter);
+    // Check if the accessor uses a cached property.
+    if (!fti->cached_property_name()->IsTheHole(isolate)) {
+      return handle(Name::cast(fti->cached_property_name()));
+    }
+  }
+  return MaybeHandle<Name>();
+}
+
 }  // namespace internal
 }  // namespace v8