[Bug ipa/115767] [12/13/14/15 regression] GCC loses track of value on aarch64 with -O2 since r11-3308-gd119f34c952f87

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115767

--- Comment #8 from Sam James <sjames at gcc dot gnu.org> ---
While we wait for Honza, Ignacy, if you could try reduce it to get rid of the
Boost dependency, it'd be appreciated.

You can cvise for runtime testcases, just add several checks with different
compilers and UBSAN and friends.