Fix optimizer up to know about lexicalref.
Fix optimizer up to know about lexicalref.

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