Lwt_log: get backtrace early to overcome exns in Printexc.to_string.
Lwt_log: get backtrace early to overcome exns in Printexc.to_string.

ocsigen/lwt,c-cube/lwt,rneswold/lwt,rneswold/lwt,ocsigen/lwt,rneswold/lwt,mfp/lwt,ocsigen/lwt,rgrinberg/lwt,mirage/lwt,c-cube/lwt,rgrinberg/lwt,mfp/lwt,fdopen/lwt,rgrinberg/lwt,fdopen/lwt,rgrinberg/lwt,c-cube/lwt,mirage/lwt