[Bug tree-optimization/71506] [5 Regression] ICE with libvpx with -floop-interchange: isl_constraint.c:627: expecting integer value

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71506

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Hmm, at r225942 I read:
...
[graphite] fix pr61929

This fixes bootstrap of GCC with BOOT_CFLAGS="-g -O2 -fgraphite-identity
-floop-nest-optimize -floop-block -floop-interchange -floop-strip-mine".  It
passes regstrap on amd64-linux.  A previous change
(https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=213816), replaced
isl_int with isl_val because isl_int would be deprecated. Since isl_val has
stricter checks, it exposed the bug.  In the test case (isl_set_max_val) would
return infinity which would remain unchecked.  We now check if the value
returned is an integer or not, and bail out if it isn't.
...

This seems to be a duplicate of PR61929.[ If we mark this as a duplicate, we
should re-open PR61929 and mark it as 5 regression. ]