[Bug c++/58678] [4.9 Regression] pykde4-4.11.2 link error (devirtualization too trigger happy)

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678

--- Comment #25 from Jason Merrill <jason at gcc dot gnu.org> ---
OK, this testcase wasn't affected by my earlier patch because ~Part is
user-defined, so it's fair game for devirtualization.

I notice, however, that in the unreduced testcase Part is an abstract class, so
it doesn't make sense to choose its destructor for speculative
devirtualization: that can never be the right answer.  I'll fix that.