Avoid some re-allocation during hash-cons of dir_path
Avoid some re-allocation during hash-cons of dir_path

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@14543 85f007b7-540e-0410-9357-904b9bb8a0f7

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