mason.test: Add option to skip benchmarks to mason.
mason.test: Add option to skip benchmarks to mason.

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