[api] Use shallow copy for the template instantiation cache

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 922 matching lines @@
   that->set_tag(i::Smi::FromInt(type));
 }
 
 
 void Template::Set(v8::Local<Name> name, v8::Local<Data> value,
                    v8::PropertyAttribute attribute) {
   auto templ = Utils::OpenHandle(this);
   i::Isolate* isolate = templ->GetIsolate();
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
+  auto value_obj = Utils::OpenHandle(*value);
+  if (value_obj->IsObjectTemplateInfo()) {
+    templ->set_serial_number(i::Smi::FromInt(0));
+    if (templ->IsFunctionTemplateInfo()) {
+      i::Handle<i::FunctionTemplateInfo>::cast(templ)->set_do_not_cache(true);
+    }
+  }
   // TODO(dcarney): split api to allow values of v8::Value or v8::TemplateInfo.
   i::ApiNatives::AddDataProperty(isolate, templ, Utils::OpenHandle(*name),
-                                 Utils::OpenHandle(*value),
+                                 value_obj,
                                  static_cast<i::PropertyAttributes>(attribute));
 }
 
 
 void Template::SetAccessorProperty(
     v8::Local<v8::Name> name,
     v8::Local<FunctionTemplate> getter,
     v8::Local<FunctionTemplate> setter,
     v8::PropertyAttribute attribute,
     v8::AccessControl access_control) {
@@ skipping 7658 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8