compiler.cfg.gvn.tests: this vocab in extra appears redundant
compiler.cfg.gvn.tests: this vocab in extra appears redundant

It is almost identical to the one in compiler.cfg.value-numbering.tests
so I think it can be removed.

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