only set interrupts pending; don't interrupt immediately
only set interrupts pending; don't interrupt immediately

This fixes an ugly Windows heisenbug wherein the R session
would crash if an interrupt was sent as the first action in
a session.

jar1karp/rstudio,john-r-mcpherson/rstudio,jzhu8803/rstudio,pssguy/rstudio,thklaus/rstudio,vbelakov/rstudio,githubfun/rstudio,tbarrongh/rstudio,brsimioni/rstudio,jrnold/rstudio,john-r-mcpherson/rstudio,suribes/rstudio,tbarrongh/rstudio,pssguy/rstudio,pssguy/rstudio,jzhu8803/rstudio,vbelakov/rstudio,edrogers/rstudio,brsimioni/rstudio,jar1karp/rstudio,jrnold/rstudio,thklaus/rstudio,JanMarvin/rstudio,edrogers/rstudio,brsimioni/rstudio,githubfun/rstudio,john-r-mcpherson/rstudio,maligulzar/Rstudio-instrumented,piersharding/rstudio,piersharding/rstudio,sfloresm/rstudio,more1/rstudio,jar1karp/rstudio,edrogers/rstudio,githubfun/rstudio,vbelakov/rstudio,piersharding/rstudio,piersharding/rstudio,suribes/rstudio,suribes/rstudio,more1/rstudio,jzhu8803/rstudio,thklaus/rstudio,edrogers/rstudio,maligulzar/Rstudio-instrumented,thklaus/rstudio,tbarrongh/rstudio,john-r-mcpherson/rstudio,JanMarvin/rstudio,john-r-mcpherson/rstudio,piersharding/rstudio,more1/rstudio,sfloresm/rstudio,githubfun/rstudio,jzhu8803/rstudio,suribes/rstudio,brsimioni/rstudio,maligulzar/Rstudio-instrumented,sfloresm/rstudio,more1/rstudio,vbelakov/rstudio,JanMarvin/rstudio,tbarrongh/rstudio,jar1karp/rstudio,tbarrongh/rstudio,piersharding/rstudio,jrnold/rstudio,maligulzar/Rstudio-instrumented,edrogers/rstudio,vbelakov/rstudio,edrogers/rstudio,JanMarvin/rstudio,jzhu8803/rstudio,tbarrongh/rstudio,brsimioni/rstudio,piersharding/rstudio,john-r-mcpherson/rstudio,vbelakov/rstudio,jrnold/rstudio,sfloresm/rstudio,jar1karp/rstudio,edrogers/rstudio,githubfun/rstudio,JanMarvin/rstudio,jzhu8803/rstudio,JanMarvin/rstudio,pssguy/rstudio,piersharding/rstudio,suribes/rstudio,sfloresm/rstudio,JanMarvin/rstudio,more1/rstudio,pssguy/rstudio,pssguy/rstudio,vbelakov/rstudio,tbarrongh/rstudio,jzhu8803/rstudio,brsimioni/rstudio,githubfun/rstudio,more1/rstudio,thklaus/rstudio,more1/rstudio,githubfun/rstudio,thklaus/rstudio,piersharding/rstudio,pssguy/rstudio,jar1karp/rstudio,jar1karp/rstudio,jrnold/rstudio,pssguy/rstudio,vbelakov/rstudio,john-r-mcpherson/rstudio,maligulzar/Rstudio-instrumented,jrnold/rstudio,maligulzar/Rstudio-instrumented,more1/rstudio,maligulzar/Rstudio-instrumented,JanMarvin/rstudio,githubfun/rstudio,suribes/rstudio,jar1karp/rstudio,sfloresm/rstudio,brsimioni/rstudio,suribes/rstudio,jar1karp/rstudio,jzhu8803/rstudio,john-r-mcpherson/rstudio,sfloresm/rstudio,suribes/rstudio,JanMarvin/rstudio,thklaus/rstudio,brsimioni/rstudio,tbarrongh/rstudio,sfloresm/rstudio,jrnold/rstudio,maligulzar/Rstudio-instrumented,jrnold/rstudio,maligulzar/Rstudio-instrumented,edrogers/rstudio,thklaus/rstudio,jrnold/rstudio