[Bug c++/91415] Invalid warning for C++17 sequencing of shift operator E1<

[maxim.yegorushkin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91415

--- Comment #1 from Maxim Egorushkin <maxim.yegorushkin at gmail dot com> ---
gcc-9.1 produces the same warning.