* Modify nlgone_exit so that it tests --vgdb-stop-at=startup,exit
* remove empty lines from nlgone_*.stdinB.gdb, as these empty
  lines are (surprisingly) repeating the previous gdb command.
  Empty lines should be be put in the *gdb files.
* And add yet another sed expression in filter_gdb to cope with
  the different place where a thread exits.
  (this filter technique is now *really* arriving in a dead end
   e.g. the link between the comment and the sed expression is very
   poor).



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13905 a5019735-40e9-0310-863c-91ae7b9d1cf9