Optimize prototype chain when creating initial maps for functions used as constructors

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index bdfa23cde59d32626192b08ec182f5e2784550e6..a306e88b04716c9e96b229aa573f7d4b7cf4ae25 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10189,6 +10189,10 @@ void JSFunction::EnsureHasInitialMap(Handle<JSFunction> function) {
   Handle<Object> prototype;
   if (function->has_instance_prototype()) {
     prototype = handle(function->instance_prototype(), isolate);
+    for (Handle<Object> p = prototype; !p->IsNull() && !p->IsJSProxy();
+         p = Object::GetPrototype(isolate, p)) {
+      JSObject::OptimizeAsPrototype(Handle<JSObject>::cast(p));
+    }
   } else {
     prototype = isolate->factory()->NewFunctionPrototype(function);
   }