[api] Make ObjectTemplate::SetNativeDataProperty() work even if the ObjectTemplate does not have a …

src/conversions-inl.h

Index: src/conversions-inl.h
diff --git a/src/conversions-inl.h b/src/conversions-inl.h
index 3e56799bc9bab501f43f6be91321d0c694336fa0..730e6477cbee3e0fb781d692ec971d5a32b7ba36 100644
--- a/src/conversions-inl.h
+++ b/src/conversions-inl.h
@@ -127,6 +127,10 @@ uint32_t NumberToUint32(Object* number) {
   return DoubleToUint32(number->Number());
 }
 
+int64_t NumberToInt64(Object* number) {
+  if (number->IsSmi()) return Smi::cast(number)->value();
+  return static_cast<int64_t>(number->Number());
+}
 
 bool TryNumberToSize(Isolate* isolate, Object* number, size_t* result) {
   SealHandleScope shs(isolate);