Fix compiler explosion in `while 0 { my $_ }`.
Fix compiler explosion in `while 0 { my $_ }`.

sjn/rakudo,samcv/rakudo,lucasbuchala/rakudo,zostay/rakudo,LLFourn/rakudo,LLFourn/rakudo,paultcochrane/rakudo,awwaiid/rakudo,zostay/rakudo,cygx/rakudo,ab5tract/rakudo,nbrown/rakudo,labster/rakudo,awwaiid/rakudo,dankogai/rakudo,nbrown/rakudo,dankogai/rakudo,sjn/rakudo,azawawi/rakudo,softmoth/rakudo,azawawi/rakudo,salortiz/rakudo,jonathanstowe/rakudo,labster/rakudo,azawawi/rakudo,raydiak/rakudo,awwaiid/rakudo,rakudo/rakudo,lucasbuchala/rakudo,nbrown/rakudo,azawawi/rakudo,raydiak/rakudo,dankogai/rakudo,skids/rakudo,ungrim97/rakudo,softmoth/rakudo,lucasbuchala/rakudo,ungrim97/rakudo,usev6/rakudo,nbrown/rakudo,b2gills/rakudo,zostay/rakudo,usev6/rakudo,ugexe/rakudo,ugexe/rakudo,tony-o/rakudo,samcv/rakudo,salortiz/rakudo,nbrown/rakudo,cygx/rakudo,ab5tract/rakudo,paultcochrane/rakudo,ugexe/rakudo,tony-o/rakudo,b2gills/rakudo,rakudo/rakudo,rakudo/rakudo,salortiz/rakudo,usev6/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,salortiz/rakudo,b2gills/rakudo,salortiz/rakudo,usev6/rakudo,dankogai/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,sjn/rakudo,dankogai/rakudo,cygx/rakudo,Gnouc/rakudo,usev6/rakudo,skids/rakudo,cygx/rakudo,lucasbuchala/rakudo,ungrim97/rakudo,b2gills/rakudo,tony-o/rakudo,nbrown/rakudo,ugexe/rakudo,sjn/rakudo,zostay/rakudo,tbrowder/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,b2gills/rakudo,raydiak/rakudo,paultcochrane/rakudo,awwaiid/rakudo,raydiak/rakudo,ungrim97/rakudo,softmoth/rakudo,skids/rakudo,Gnouc/rakudo,ab5tract/rakudo,Gnouc/rakudo,cognominal/rakudo,awwaiid/rakudo,rakudo/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,paultcochrane/rakudo,rakudo/rakudo,salortiz/rakudo,tbrowder/rakudo,softmoth/rakudo,jonathanstowe/rakudo,labster/rakudo,skids/rakudo,labster/rakudo,labster/rakudo,ab5tract/rakudo,samcv/rakudo,MasterDuke17/rakudo,sjn/rakudo,ungrim97/rakudo,labster/rakudo,rakudo/rakudo,ab5tract/rakudo,tony-o/rakudo,tony-o/rakudo,ugexe/rakudo,cognominal/rakudo,LLFourn/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,cygx/rakudo,LLFourn/rakudo,tbrowder/rakudo,skids/rakudo,tony-o/rakudo,softmoth/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,cognominal/rakudo,samcv/rakudo,cognominal/rakudo,samcv/rakudo,azawawi/rakudo,paultcochrane/rakudo,MasterDuke17/rakudo,LLFourn/rakudo,cognominal/rakudo