compiler.cfg.liveness: look up leaders (if possible) so liveness analysis doesn't break after leaving SSA (issue #22)
compiler.cfg.liveness: look up leaders (if possible) so liveness analysis doesn't break after leaving SSA (issue #22)

mrjbq7/factor,slavapestov/factor,bjourne/factor,sarvex/factor-lang,slavapestov/factor,factor/factor,mrjbq7/factor,tgunr/factor,nicolas-p/factor,sarvex/factor-lang,slavapestov/factor,factor/factor,mrjbq7/factor,slavapestov/factor,bjourne/factor,nicolas-p/factor,sarvex/factor-lang,bjourne/factor,tgunr/factor,factor/factor,tgunr/factor,bpollack/factor,tgunr/factor,slavapestov/factor,AlexIljin/factor,bpollack/factor,AlexIljin/factor,tgunr/factor,slavapestov/factor,bjourne/factor,AlexIljin/factor,nicolas-p/factor,nicolas-p/factor,factor/factor,dch/factor,factor/factor,nicolas-p/factor,bjourne/factor,bjourne/factor,sarvex/factor-lang,dch/factor,nicolas-p/factor,bpollack/factor,nicolas-p/factor,dch/factor,AlexIljin/factor,bpollack/factor,AlexIljin/factor,dch/factor,bpollack/factor,dch/factor,dch/factor,mrjbq7/factor,AlexIljin/factor,AlexIljin/factor,slavapestov/factor,bpollack/factor,sarvex/factor-lang,mrjbq7/factor,sarvex/factor-lang,bjourne/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,sarvex/factor-lang,factor/factor