[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Correction, on both x86_64 and ppc64le it requires all of:

-fstrict-aliasing  -ftree-loop-vectorize -ftree-sra -ftree-ch -ftree-forwprop
-ftree-copy-prop