[Bug c++/61531] Optimizer completely removes some bitset code

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61531

--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
4.3 is ancient and unsupported. Can you try to reproduce with 4.8 or later? (I
don't see it with 4.4, which is the oldest I have here)