add another fast-path in generator exit code that avoids exception normalisation of exact StopIteration objects
add another fast-path in generator exit code that avoids exception normalisation of exact StopIteration objects

andreasvc/cython,fperez/cython,fabianrost84/cython,scoder/cython,ChristopherHogan/cython,andreasvc/cython,hickford/cython,scoder/cython,JelleZijlstra/cython,mcanthony/cython,ChristopherHogan/cython,hhsprings/cython,roxyboy/cython,encukou/cython,scoder/cython,dahebolangkuan/cython,madjar/cython,acrispin/cython,cython/cython,mrGeen/cython,dahebolangkuan/cython,dahebolangkuan/cython,c-blake/cython,slonik-az/cython,encukou/cython,acrispin/cython,andreasvc/cython,hickford/cython,hhsprings/cython,mcanthony/cython,roxyboy/cython,marscher/cython,hhsprings/cython,slonik-az/cython,dahebolangkuan/cython,andreasvc/cython,fabianrost84/cython,c-blake/cython,madjar/cython,acrispin/cython,c-blake/cython,mrGeen/cython,da-woods/cython,da-woods/cython,marscher/cython,mrGeen/cython,encukou/cython,hhsprings/cython,achernet/cython,fabianrost84/cython,JelleZijlstra/cython,scoder/cython,da-woods/cython,JelleZijlstra/cython,hickford/cython,madjar/cython,cython/cython,mcanthony/cython,mrGeen/cython,achernet/cython,JelleZijlstra/cython,hhsprings/cython,JelleZijlstra/cython,roxyboy/cython,fperez/cython,cython/cython,fabianrost84/cython,mcanthony/cython,mcanthony/cython,madjar/cython,acrispin/cython,achernet/cython,acrispin/cython,fperez/cython,encukou/cython,slonik-az/cython,marscher/cython,roxyboy/cython,ChristopherHogan/cython,slonik-az/cython,cython/cython,achernet/cython,fabianrost84/cython,mrGeen/cython,marscher/cython,hickford/cython,dahebolangkuan/cython,achernet/cython,slonik-az/cython,c-blake/cython,roxyboy/cython,encukou/cython,hickford/cython,c-blake/cython,fperez/cython,marscher/cython,madjar/cython,da-woods/cython,andreasvc/cython,fperez/cython