[Bug lto/88147] [9 Regression] ICE in linemap_line_start, at libcpp/line-map.c:781 starting from r265875

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88147

--- Comment #7 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
I've been trying to reproduce this, but failing - I tried with today's trunk,
and with a build from 2018-11-16.

Do you have a revision that is known to trigger the ICE?