[Bug tree-optimization/80612] ICE compiling grep-3.0 and m4-1.4.18 with LTO

[sven.c.dack at sky dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80612

--- Comment #1 from Sven C. Dack <sven.c.dack at sky dot com> ---
The same ICE can be seen when compiling bison-3.0.4, coreutils-8.27 and
tar-1.29, because these, too, makes use of the same "obstack.c" file.