Optimize IO::Handle.lines post-GLR.
Optimize IO::Handle.lines post-GLR.

Just implemnet a special iterator directly for it. It ain't much code
and it pulls its weight for the fast path. Toss the :eager variant as
it's likely marginal now, and if it ain't then the better way is to
implement push-exactly in the iterators.

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