Parser: delete rule numbers + validate shift/reduce conlicts
Parser: delete rule numbers + validate shift/reduce conlicts

Rule numbers tend to go out-of-date, and aren't useful.

And during validate, the actual number of shift/reduce
conflicts is now checked against the number stated in Parser.y.

Reviewed by: bgamari

Differential Revision: https://phabricator.haskell.org/D1754

tjakway/ghcjvm,sdiehl/ghc,mettekou/ghc,snoyberg/ghc,sdiehl/ghc,mcschroeder/ghc,olsner/ghc,olsner/ghc,gridaphobe/ghc,snoyberg/ghc,tjakway/ghcjvm,tjakway/ghcjvm,shlevy/ghc,mettekou/ghc,olsner/ghc,ezyang/ghc,oldmanmike/ghc,snoyberg/ghc,mcschroeder/ghc,gridaphobe/ghc,mcschroeder/ghc,snoyberg/ghc,sdiehl/ghc,ezyang/ghc,gridaphobe/ghc,olsner/ghc,oldmanmike/ghc,vTurbine/ghc,vikraman/ghc,nushio3/ghc,vTurbine/ghc,mcschroeder/ghc,sgillespie/ghc,sdiehl/ghc,mcschroeder/ghc,sgillespie/ghc,nushio3/ghc,nushio3/ghc,snoyberg/ghc,olsner/ghc,mettekou/ghc,mettekou/ghc,vTurbine/ghc,vTurbine/ghc,ezyang/ghc,shlevy/ghc,gridaphobe/ghc,shlevy/ghc,gridaphobe/ghc,ezyang/ghc,shlevy/ghc,nushio3/ghc,sdiehl/ghc,oldmanmike/ghc,mettekou/ghc,sgillespie/ghc,sgillespie/ghc,sdiehl/ghc,tjakway/ghcjvm,nushio3/ghc,mcschroeder/ghc,sgillespie/ghc,gridaphobe/ghc,vTurbine/ghc,nushio3/ghc,shlevy/ghc,sdiehl/ghc,oldmanmike/ghc,vikraman/ghc,tjakway/ghcjvm,vikraman/ghc,ezyang/ghc,olsner/ghc,vikraman/ghc,ezyang/ghc,shlevy/ghc,sgillespie/ghc,vikraman/ghc,vikraman/ghc,vikraman/ghc,oldmanmike/ghc,mettekou/ghc,olsner/ghc,ezyang/ghc,tjakway/ghcjvm,vTurbine/ghc,shlevy/ghc,mcschroeder/ghc,tjakway/ghcjvm,gridaphobe/ghc,sgillespie/ghc,oldmanmike/ghc,nushio3/ghc,mettekou/ghc,oldmanmike/ghc,vTurbine/ghc,snoyberg/ghc,snoyberg/ghc