* util.c (run_cleanup_chain, make_run_cleanup, do_run_cleanups):

	* util.c (run_cleanup_chain, make_run_cleanup, do_run_cleanups):
	New cleanup clean for cleanups to be run when at each 'run' command.
	* infcmd.c (run_command):  Call do_run_cleanups.
	* solib.c (find_solib):  Register cleanup to call clear_solib
	on a new 'run' command.
	(symbol_add_stub):  First look for existing objfile with same name.