fixup! src: zero-initialize data that are copied into the snapshot

Author: joyeecheung

src/node_snapshotable.cc

@@ -1415,8 +1415,8 @@ StartupData SerializeNodeContextInternalFields(Local<Object> holder,
   // To serialize the type field, save data in a EmbedderTypeInfo.
   if (index == BaseObject::kEmbedderType) {
     int size = sizeof(EmbedderTypeInfo);
-    char* data = new char[size];
-    memset(data, 0, size);  // Make the padding reproducible.
+    // Zero-initialize to make the padding reproducible.
+    char* data = new char[size]();
     // We need to use placement new because V8 calls delete[] on the returned
     // data.
     // TODO(joyeecheung): support cppgc objects.