Fix broken div uses.
Fix broken div uses.

Rational.pm was written to work with NQP Parrot's broken infix:<div>.  Since NQP JVM now has a properly working infix:<div>, a bunch of these functions started failing.  This corrects floor, ceiling, and Int.

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