src: add not-weak DCHECK to PersistentToLocal::Strong

Refs: #38821 (comment)

PR-URL: #38875
Reviewed-By: Stephen Belanger <[email protected]>
Reviewed-By: Bryan English <[email protected]>
Reviewed-By: Gerhard Stöbich <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>

Author: addaleax

src/util.h

@@ -772,6 +772,7 @@ class PersistentToLocal {
   template <class TypeName>
   static inline v8::Local<TypeName> Strong(
       const v8::PersistentBase<TypeName>& persistent) {
+    DCHECK(!persistent.IsWeak());
     return *reinterpret_cast<v8::Local<TypeName>*>(
         const_cast<v8::PersistentBase<TypeName>*>(&persistent));
   }