[test] Fix test-api.cc test for caching of FunctionTemplate.

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 1258 matching lines @@
     i::Isolate* isolate, FunctionCallback callback,
     experimental::FastAccessorBuilder* fast_handler, v8::Local<Value> data,
     v8::Local<Signature> signature, int length, bool do_not_cache,
     v8::Local<Private> cached_property_name = v8::Local<Private>()) {
   i::Handle<i::Struct> struct_obj =
       isolate->factory()->NewStruct(i::FUNCTION_TEMPLATE_INFO_TYPE);
   i::Handle<i::FunctionTemplateInfo> obj =
       i::Handle<i::FunctionTemplateInfo>::cast(struct_obj);
   InitializeFunctionTemplate(obj);
   obj->set_do_not_cache(do_not_cache);
-  int next_serial_number = 0;
+  int next_serial_number = i::FunctionTemplateInfo::kInvalidSerialNumber;
   if (!do_not_cache) {
     next_serial_number = isolate->heap()->GetNextTemplateSerialNumber();
   }
   obj->set_serial_number(i::Smi::FromInt(next_serial_number));
   if (callback != 0) {
     if (data.IsEmpty()) {
       data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
     }
     Utils::ToLocal(obj)->SetCallHandler(callback, data, fast_handler);
   }
@@ skipping 8686 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