[Bug middle-end/58585] [4.9 Regression] ICE in ipa with virtual inheritance

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58585

--- Comment #12 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 31763
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31763&action=edit
Proposed fix 2

It turns out that in the case of multiple inheritance we may miss vtables on
certain paths when it is duplicated binfo for shared base.  This patch won't
ICE in this case.