[Bug testsuite/91258] [10 regression] g++.dg/ubsan/vla-1.C and gcc.dg/strlenopt-70.c fail starting with r273783

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91258

--- Comment #1 from seurer at gcc dot gnu.org ---
The gcc.dg/strlenopt-70.c failure looks like it only occurs on BE.