Fix JVM breakage of warnings
Fix JVM breakage of warnings

Also re-instate private .first to make the most common case of warnings be
as lazy as possible (using the Any.first would vivify all entries still).

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