[Bug tree-optimization/69426] [6 Regression] ICE: verify_ssa failed (error: missing definition) w/ -O2 (and above) -ftree-parallelize-loops=2

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69426

--- Comment #2 from vries at gcc dot gnu.org ---
Created attachment 37431
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37431&action=edit
tentative patch