[Bug tree-optimization/92765] [10 Regression] Wrong code caused by folding of -Wstring-compare since r276773

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92765

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note, determine_min_objsize calls compute_builtin_object_size with 2 rather
than 3, which means it is in this regard conservative and uses whole object
size rather than just subobject, we've been there in the past, punt on some
optimizations before the first objsz pass and for subobject sizes compute them
early now.  But the rest of determine_min_objsize, if
compute_builtin_object_size fails, ignores this and thinks it can use subobject
sizes when it can't.