gdb:
Fix PR gdb/14617.
* NEWS: Mention new MI notification "=tracepoint-modified".
* breakpoint.c (trace_pass_set_count): Update caller of
observer_notify_tracepoint_modified.
* mi/mi-cmd-break.c (mi_cmd_break_passcount): Likewise.
* mi/mi-interp.c: Declare 'mi_tracepoint_modified'.
(mi_interpreter_init): Attach 'mi_tracepoint_modified'
to 'tracepoint-modified' observer.
(mi_breakpoint_modified): New.
* observer.sh (struct objfile;): Declare 'struct tracepoint'.
gdb/testsuite:
Fix PR gdb/14617.
* gdb.mi/mi-breakpoint-changed.exp (test_insert_delete_modify):
Remove setup_kfail, and update test.