[Bug tree-optimization/79390] [7 Regression] 10% performance drop in SciMark2 LU after r242550

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79390

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 41097
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41097&action=edit
gcc7-pr79390.patch

Untested fix.