gdb/

gdb/
	* infrun.c (struct execution_control_state): New member
	stop_func_filled_in.
	(clear_stop_func, fill_in_stop_func): New functions.
	(handle_inferior_event): Call clear_stop_func rather than
	manipulating the execution control state directly.
	Call fill_in_stop_func lazily as required rather than
	directly calling find_pc_partial_function in all cases.