Display per-thread information for threads in FreeBSD cores.
    
    Display the LWP ID of each thread in a FreeBSD core.  Extract thread
    names from the per-thread THRMISC note.
    
    gdb/ChangeLog:
    
    	* fbsd_tdep.c (fbsd_core_pid_to_str): New function.
    	(fbsd_core_thread_name): New function.
    	(fbsd_init_abi): Add "core_pid_to_str" gdbarch method.
    	Add "core_thread_name" gdbarch method.