[Bug tree-optimization/102893] [9/10/11 Regression] CDDCE does not detect empty infinite nested loops

[tnfchris at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102893

--- Comment #4 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Thanks for the fix!

This was reported to us by a user of the arm embedded toolchains that was
upgrading from gcc 7.  We won't be releasing any new releases for GCC 8 and 9,
but may be for 10 and 11 is certain.

So a backport to 11 and if possible 10 would be great as it avoids us having to
possibly carry the patch in a vendor branch.