[Bug tree-optimization/92768] [8/9/10 Regression] Maybe a wrong code for vector constants

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92768

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Possibly the ->equal_p () use in vector-builder elides the -0.0 since it
may appear "equal" to 0.0?