[Bug tree-optimization/102224] Incorrect compile on `x * copysign(1.0, x)`

[gabravier at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102224

--- Comment #1 from Gabriel Ravier <gabravier at gmail dot com> ---
(Note: this is a miscompile because it compiles as equivalent to `return 0;` as
that's what `xorps xmm0, xmm0` will do)