[Bug ipa/61659] [4.9/4.10 Regression] Extra undefined symbol because of devirtualization

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61659

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 33036
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33036&action=edit
testcase