[cxxmodules] Added missing PushTransactionRAII to rootcling.
[cxxmodules] Added missing PushTransactionRAII to rootcling.

With modules rootcling can now deserialize decls from this method,
so we need to have a transaction when running this code.

olifre/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,zzxuanyuan/root,karies/root,karies/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,zzxuanyuan/root,zzxuanyuan/root,root-mirror/root,karies/root,olifre/root,karies/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,karies/root,zzxuanyuan/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,zzxuanyuan/root,root-mirror/root,zzxuanyuan/root,olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,zzxuanyuan/root