[Bug ipa/121936] Invalid optimisation (at O3) based on bodies of weak-defined functions

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121936

--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
perhaps its a dup of that older bug - but it certainly fires more often on
current WIP for new C++ language features - (the test-case was constructed to
show a similar effect on unpatched trunk).