[Bug c++/60553] segfault in gt_ggc_mx_lang_tree_node in Chromium with LTO

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60553

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
I've posted the patches but I'm curious if the 2nd change alone helps enough. 
The first is somewhat handwaving (because we also have type_non_common which
breaks the argument of the former).