[Bug middle-end/86711] wrong folding of memchr

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86711

--- Comment #1 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Created attachment 44458
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44458&action=edit
untestted patch