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

[Ulrich.Windl at rz dot uni-regensburg.de]

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

--- Comment #1 from Ulrich Windl <Ulrich.Windl at rz dot uni-regensburg.de> ---
Exact version of g++ is that of SLES11 SP3 for x86_64 (gcc-c++-4.3-62.198).