This patch is for the gdbserver.

2011-01-04  Hui Zhu  <teawater@gmail.com>

	* tracepoint.c (gdb_agent_op): Add gdb_agent_op_printf.
	(gdb_agent_op_names): Add "printf".
	(tp_printf): New function.
	(eval_agent_expr): Handle gdb_agent_op_printf.