Use a faster algorithm to check for class existence.
Use a faster algorithm to check for class existence.

There is a hidden invariant that guarantees that the class index and its
reference field are the same.

JasonGross/coq,JasonGross/coq,gares/coq,Zimmi48/coq,ejgallego/coq,Zimmi48/coq,Zimmi48/coq,gares/coq,JasonGross/coq,coq/coq,coq/coq,ejgallego/coq,gares/coq,coq/coq,gares/coq,ejgallego/coq,silene/coq,gares/coq,coq/coq,SkySkimmer/coq,ejgallego/coq,JasonGross/coq,silene/coq,silene/coq,Zimmi48/coq,SkySkimmer/coq,SkySkimmer/coq,SkySkimmer/coq