gdb/gdbserver:

	* ax.h (struct eval_agent_expr_context): New.
	(gdb_eval_agent_expr): Update declaration.
	* ax.c (gdb_eval_agent_expr): Remove argument REGCACHE and
	TFRAME.  Add new argument CTX.
	* server.h (struct eval_agent_expr_context): Declare.
	(agent_mem_read, agent_tsv_read): Update declaration.
	(agent_mem_read_string): Likewise.
	* tracepoint.c (eval_tracepoint_agent_expr): Remove.
	(add_traceframe_block): Add new argument TPOINT.
	Increase TPOINT->traceframe_usage.
	(do_action_at_tracepoint): Call gdb_eval_agent_expr instead of
	eval_tracepoint_agent_expr.
	(condition_true_at_tracepoint): Likewise.
	(agent_mem_read): Remove argument TFRAME.  Add argument CTX.
	(agent_mem_read_string, agent_tsv_read): Likewise.
	Callers update.

gdb/testsuite:

	* gdb.trace/infotrace.exp: Check 'traceframe usage' in the
	output of 'info tracepoints'.
	* gdb.trace/disconnected-tracing.exp (disconnected_tracing):
	Likewise.
	* gdb.trace/tstatus.exp (run_trace_experiment): Likewise.
	* gdb.trace/disconnected-tracing.c (struct foo): New.