[Bug lto/61886] [4.8/4.9/5 Regression] LTO breaks fread with _FORTIFY_SOURCE=2

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61886

--- Comment #36 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
This is probably too risky to fix for 5.1
(https://gcc.gnu.org/ml/gcc/2015-03/msg00241.html) though I am having WIP patch
now - we need to introduce transparent alias support and make lto-symtab to
turn incompatible decls into transparent aliases.

I hope to have patch ready in a week for consideration. Chromium is using
fortify, so it would be nice to fix this.