Optimize .flat somewhat.
Optimize .flat somewhat.

This cuts a further 20% off "for 1..100 X 1..100 { }".

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