[Bug tree-optimization/69039] [6 regression] segfault with ftree-parallelize-loops=2

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69039

--- Comment #8 from vries at gcc dot gnu.org ---
Created attachment 37135
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37135&action=edit
tentative patch that fixes invalid phi argument error