Adding more sharing in Map.udpate and Map.modify.
Adding more sharing in Map.udpate and Map.modify.

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