[Bug tree-optimization/69108] [6 Regression] ICE in gather_scalar_reductions with -ftree-parallelize-loops=2

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69108

--- Comment #2 from vries at gcc dot gnu.org ---
Created attachment 37232
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37232&action=edit
tentative patch