[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 #2 from Ulrich Windl <Ulrich.Windl at rz dot uni-regensburg.de> ---
Created attachment 32948
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32948&action=edit
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