Various return typecheck/decont optimizations.
Various return typecheck/decont optimizations.

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