[Bug tree-optimization/69110] [4.9/5/6 Regression] execution failure in gcc.c-torture/execute/doloop-{1,2}.c with -ftree-parallelize-loops=2

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69110

--- Comment #12 from vries at gcc dot gnu.org ---
Created attachment 37277
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37277&action=edit
tentative patch

I don't understand the problem well enough yet to say if this is a fix or a
workaround. But at least the patch fixes the problem.