Correctly share opaque references in CClosure reftab.
Correctly share opaque references in CClosure reftab.

SkySkimmer/coq,ejgallego/coq,ejgallego/coq,SkySkimmer/coq,SkySkimmer/coq,Zimmi48/coq,Zimmi48/coq,ejgallego/coq,Zimmi48/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq,coq/coq,coq/coq,ejgallego/coq,coq/coq