[Bug tree-optimization/89672] NULL pointer check optimized out for the return value of memchr(NULL, c, 0)

[him at revl dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89672

--- Comment #4 from Damon Revoe <him at revl dot org> ---
And that fact is used by the optimizer. I see. Thanks!