* inf-ttrace.c (inf_ttrace_private_thread_info): New structure type.

	* inf-ttrace.c (inf_ttrace_private_thread_info): New structure type.
        (inf_ttrace_delete_dying_threads_callback): New function.
        (inf_ttrace_resume): After resuming the execution, iterate over
        the dying threads to delete them for the thread list.
        (inf_ttrace_wait): on TTEVT_LWP_EXIT and TTEVT_LWP_TERMINATE,
        mark the corresponding thread as dying instead of removing it
        from the thread list.
        (inf_ttrace_thread_alive): return 0 for dying threads.