Make optimizer more robust
Make optimizer more robust

Block has no method is_dispatcher, but it seems we now report
"will never work" errors on blocks too.

Maybe this is the wrong approach, and the codegen should be changed
to produce routines where blocks appear now; if so, somebody else
must do that :-/

raydiak/rakudo,nbrown/rakudo,usev6/rakudo,tbrowder/rakudo,dankogai/rakudo,sjn/rakudo,samcv/rakudo,sjn/rakudo,samcv/rakudo,tony-o/rakudo,b2gills/rakudo,MasterDuke17/rakudo,LLFourn/rakudo,ungrim97/rakudo,paultcochrane/rakudo,tbrowder/rakudo,tony-o/rakudo,zostay/rakudo,usev6/rakudo,ungrim97/rakudo,ungrim97/rakudo,Gnouc/rakudo,raydiak/rakudo,rakudo/rakudo,samcv/rakudo,b2gills/rakudo,usev6/rakudo,Gnouc/rakudo,labster/rakudo,awwaiid/rakudo,raydiak/rakudo,sjn/rakudo,ungrim97/rakudo,salortiz/rakudo,LLFourn/rakudo,labster/rakudo,tbrowder/rakudo,salortiz/rakudo,rakudo/rakudo,ugexe/rakudo,labster/rakudo,MasterDuke17/rakudo,lucasbuchala/rakudo,salortiz/rakudo,azawawi/rakudo,dankogai/rakudo,tony-o/rakudo,ab5tract/rakudo,dankogai/rakudo,b2gills/rakudo,dankogai/rakudo,MasterDuke17/rakudo,nbrown/rakudo,tbrowder/rakudo,sjn/rakudo,jonathanstowe/rakudo,labster/rakudo,azawawi/rakudo,paultcochrane/rakudo,ab5tract/rakudo,Gnouc/rakudo,raydiak/rakudo,samcv/rakudo,samcv/rakudo,ugexe/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,ab5tract/rakudo,ab5tract/rakudo,nbrown/rakudo,jonathanstowe/rakudo,rakudo/rakudo,tbrowder/rakudo,salortiz/rakudo,jonathanstowe/rakudo,labster/rakudo,softmoth/rakudo,rakudo/rakudo,LLFourn/rakudo,ab5tract/rakudo,awwaiid/rakudo,zostay/rakudo,tony-o/rakudo,zostay/rakudo,ugexe/rakudo,b2gills/rakudo,zostay/rakudo,softmoth/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,labster/rakudo,paultcochrane/rakudo,tbrowder/rakudo,awwaiid/rakudo,ugexe/rakudo,b2gills/rakudo,awwaiid/rakudo,dankogai/rakudo,nbrown/rakudo,ugexe/rakudo,rakudo/rakudo,sjn/rakudo,ungrim97/rakudo,paultcochrane/rakudo,softmoth/rakudo,nbrown/rakudo,salortiz/rakudo,rakudo/rakudo,azawawi/rakudo,salortiz/rakudo,paultcochrane/rakudo,usev6/rakudo,LLFourn/rakudo,softmoth/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,tony-o/rakudo,Gnouc/rakudo,LLFourn/rakudo,lucasbuchala/rakudo,azawawi/rakudo,jonathanstowe/rakudo,softmoth/rakudo,azawawi/rakudo,usev6/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,tony-o/rakudo,nbrown/rakudo,MasterDuke17/rakudo