[Bug target/120870] [16 regression] CPython miscompiled with preserve_none and CFLAGS="-O2 -march=znver2 -ggdb3"

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120870

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 61837
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61837&action=edit
A patch

Please try this.  No idea why it works for me.