[PMC] Promoted a frequent STRING to a CONST_STRING.
[PMC] Promoted a frequent STRING to a CONST_STRING.

ObjectRef's string "$!OBJECTREF" can safely be a constant.  This is a minor
optimization.

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