[Bug c++/100629] Regression from 10 symbol mismatch between class definition and use with/without optimization

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100629

--- Comment #22 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This doesn't seem to be a compiler change, because I see the same mangling
compiling the .ii with GCC 10 (after adjusting the .ii to remove the uses of
the new intrinsics from GCC 11). So possibly a library change.