[Bug target/90568] stack protector should use cmp or sub, not xor, to allow macro-fusion on x86

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90568

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 46401
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46401&action=edit
gcc10-pr90568-2.patch

Incremental untested patch for the macro-fusion, on top of
https://gcc.gnu.org/ml/gcc-patches/2019-05/msg01541.html