* infrun.c (handle_inferior_event)

	* infrun.c (handle_inferior_event)
	<BPSTAT_WHAT_SET_LONGJMP_RESUME>: Don't delete the step-resume
	breakpoint.
	<BPSTAT_WHAT_CLEAR_LONGJMP_RESUME>: Remove longjmp logic; use
	exception logic in all cases.  Update comments.
	(insert_longjmp_resume_breakpoint): Set the exception resume
	breakpoint.
testsuite
	* gdb.base/longjmp.c (hidden_longjmp): Move expected catch
	location...
	(main): ...here.