gdb/doc:

gdb/doc:

	* gdb.texinfo (GDB/MI Async Records): Document new MI
	notifications '=tsv-created' and '=tsv-deleted'.
	* observer.texi (GDB Observers): New observer tsv_created and
	tsv_deleted.

gdb:

	* mi/mi-interp.c: Declare mi_tsv_created and mi_tsv_deleted.
	(mi_interpreter_init): Call observer_attach_tsv_created and
	observer_attach_tsv_deleted.
	(mi_tsv_created, mi_tsv_deleted): New.
	* tracepoint.c (delete_trace_state_variable): Call
	observer_notify_tsv_deleted.
	(trace_variable_command): Call observer_notify_tsv_created.
	(delete_trace_variable_command): Call
	observer_notify_tsv_deleted.
	(create_tsv_from_upload): Call observer_notify_tsv_created.
	* NEWS: Mention it.

gdb/testsuite:

	gdb.trace/mi-tsv-changed.exp: New.