Remove obsolete X::Syntax::ArgFlattener
Remove obsolete X::Syntax::ArgFlattener

Since commit 0b1722b40ec464a627e345ede103e3b7e5f5efce | is now a generic
flattener instead of only an argument flattener. So no one is gonna
throw an X::Syntax::ArgFlattener exception anymore.

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