Eliminate $! and $/ when trivially unused.
Eliminate $! and $/ when trivially unused.

Where "trivially unused" holds in many of the simple operators in the
setting. This saves two Scalar allocations for many of them.

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