[Bug tree-optimization/90892] [9/10 regression] -O2 miscompiles __builtin_strncmp with string containing '\0'

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90892

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  We turn it into _8 = __builtin_strcmp (&b, "A\x00"); and then
inline-expansion to RTL compares beyond the literal zero.

I think turning it into strcmp is wrong.