[Bug tree-optimization/68756] [6 Regression] ICE w/ -O1 -floop-nest-optimize and isl 0.15: isl-0.15/isl_id.c:213: unable to find id

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68756

--- Comment #8 from vries at gcc dot gnu.org ---
Created attachment 38240
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38240&action=edit
tentative patch for second snippet