sequences: fix map-reduce to have ..a on the stack for the first call.
sequences: fix map-reduce to have ..a on the stack for the first call.

factor/factor,mrjbq7/factor,tgunr/factor,bpollack/factor,bpollack/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,tgunr/factor,mrjbq7/factor,factor/factor,factor/factor,tgunr/factor,bpollack/factor,bpollack/factor,mrjbq7/factor,AlexIljin/factor,AlexIljin/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,tgunr/factor,bpollack/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,mrjbq7/factor,factor/factor,AlexIljin/factor