Fix for bug #4280: "decide equality produces terms that don't compute well".
Fix for bug #4280: "decide equality produces terms that don't compute well".

We postpone the rewriting of hypothesis until we actually commit to one
branch instead of doing it upfront.

ejgallego/coq,amintimany/coq,TheTypoMaster/coq,maximedenes/coq,letouzey/coq-wip,ppedrot/coq,mlasson/coq,letouzey/coq-wip,8l/coq,Zimmi48/coq,TheTypoMaster/coq,Zimmi48/coq,coq/coq,amintimany/coq,coq/coq,gares/coq,amintimany/coq,SkySkimmer/coq,mattam82/coq,8l/coq,mattam82/coq,Ptival/coq,TheTypoMaster/coq,gares/coq,Lionel-Rieg/coq,barras/coq,jpdeplaix/coq,letouzey/coq-wip,SkySkimmer/coq,Zimmi48/coq,letouzey/coq-wip,TOSPIO/coq,8l/coq,JasonGross/coq,TOSPIO/coq,ejgallego/coq,ejgallego/coq,silene/coq,Matafou/coq,SkySkimmer/coq,maximedenes/coq,maximedenes/coq,TOSPIO/coq,mattam82/coq,william-lawvere/coq,Ptival/coq,maximedenes/coq,Matafou/coq,jpdeplaix/coq,SkySkimmer/coq,JasonGross/coq,coq/coq,maximedenes/coq,ejgallego/coq,ppedrot/coq,ppedrot/coq,Matafou/coq,herbelin/github-coq,ppedrot/coq,william-lawvere/coq,william-lawvere/coq,Ptival/coq,gares/coq,gares/coq,ppedrot/coq,Lionel-Rieg/coq,Lionel-Rieg/coq,herbelin/github-coq,mlasson/coq,JasonGross/coq,gares/coq,barras/coq,letouzey/coq-wip,silene/coq,Zimmi48/coq,jpdeplaix/coq,coq/coq,JasonGross/coq,silene/coq,barras/coq,herbelin/github-coq,mlasson/coq