Some jextract samples crash with: "updating map that does not need updating"

When running jextract samples, some of them crash with:

    # Internal Error (h:\openjdk\foreign-jextract\src\hotspot\share\runtime/registerMap.hpp:106), pid=11036, tid=5508
    # assert(_update_map) failed: updating map that does not need updating

It seems that sometimes the RegisterMap that is passed to frame::sender_for_entry_frame does not need to be updated (even though that function clears it).

We can avoid the assert by checking update_map() before trying to update the link register