This function resumes a suspended watchpoint:

 	Function:	IO$_LD_CONTROL

 	P1 = address of suspend_list structures
 	P2 = size in bytes of suspend_list buffer
 	P6 = Subfunction: LDIO$K_RESUME_WATCH

 	IOSB word 0 = status
 	     word 1 = number of bytes written

 	Errors returned:

 	SS$_INSFMEM	Not enough memory to allocate temporary buffer
 	SS$_ACCVIO	Buffer can not be written
 	SS$_DATALOST	No active watchpoints
 	SS$_DATACHECK	Nothing resumed
 	SS$_NORMAL	Successful completion