[Bug tree-optimization/82451] New: [GRAPHITE] codegen error in get_rename_from_scev

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82451

            Bug ID: 82451
           Summary: [GRAPHITE] codegen error in get_rename_from_scev
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
                CC: spop at gcc dot gnu.org
  Target Milestone: ---

Another case.

Here we end up with an evolution in the containing loop (that is not part of
the scop).  But we don't know how to code-gen that.  Given we introduced the
dimension
in a way the counting IV would always be zero but did _not_ invent a real
"loop".

So we're missing a parameter to the SCOP I guess specifying that single value
corresponding to the outer loop canonical IV.

Will attach testcases.