[Bug tree-optimization/65170] [5 Regression] curve25519-donna-c64 miscompilation

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65170

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 34844
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34844&action=edit
gcc5-pr65170.patch

Untested fix.