Attempt to preserve casts during a refine, especially VMcast placed by vm_cast_no_check
Attempt to preserve casts during a refine, especially VMcast
placed by vm_cast_no_check

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@13703 85f007b7-540e-0410-9357-904b9bb8a0f7

Zimmi48/coq,TOSPIO/coq,ppedrot/coq,mattam82/Coq-misc,gares/coq,silene/coq,coq/coq,gares/coq,mlasson/coq,JasonGross/coq,ale-f/coq,tomprince/coq,pirbo/coq,gares/coq,JasonGross/coq,silene/coq,ejgallego/coq,TheTypoMaster/coq,maximedenes/coq,amintimany/coq,ppedrot/coq,coq/coq,JasonGross/coq,ejgallego/coq,tomprince/coq,shindere/coq,coq/coq,aspiwack/coq,aspiwack/coq,Zimmi48/coq,pirbo/coq,letouzey/coq-wip,pirapira/coq2rust,mattam82/coq,mattam82/Coq-misc,maximedenes/coq,TheTypoMaster/coq,jhjourdan/coq,silene/coq,Lionel-Rieg/coq,tomprince/coq,herbelin/github-coq,asr/coq,SkySkimmer/coq,william-lawvere/coq,shindere/coq,barras/coq,mlasson/coq,JasonGross/coq,8l/coq,mattam82/coq,Lionel-Rieg/coq,letouzey/coq-wip,barras/coq,gmalecha/coq,ppedrot/coq,Matafou/coq,Ptival/coq,jhjourdan/coq,amintimany/coq,amintimany/coq,SkySkimmer/coq,pirbo/coq,gares/coq,jpdeplaix/coq,letouzey/coq-wip,ejgallego/coq,jpdeplaix/coq,ale-f/coq,ppedrot/coq,ppedrot/coq,TOSPIO/coq,SkySkimmer/coq,TheTypoMaster/coq,maximedenes/coq,Zimmi48/coq,ejgallego/coq,coq/coq,ale-f/coq,asr/coq,jpdeplaix/coq,8l/coq,william-lawvere/coq,Zimmi48/coq,TOSPIO/coq,Ptival/coq,letouzey/coq-wip,mattam82/coq,Ptival/coq,Matafou/coq,jhjourdan/coq,SkySkimmer/coq,maximedenes/coq,herbelin/github-coq,gmalecha/coq,asr/coq,aspiwack/coq,shindere/coq,gmalecha/coq,gares/coq,herbelin/github-coq,Lionel-Rieg/coq,letouzey/coq-wip,mlasson/coq,Matafou/coq,pirapira/coq2rust,barras/coq,8l/coq,maximedenes/coq,pirapira/coq2rust,william-lawvere/coq