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

[msebor at gcc dot gnu.org]

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

--- Comment #10 from Martin Sebor <msebor at gcc dot gnu.org> ---
The only interesting difference I see between your powerpc64-linux configure
options and mine is that yours has --with-cpu=power8 (it would be nice to add
it to test-summary).  Let me try a build with that option to see if I can
reproduce it.