[Bug c++/79095] [7 regression] spurious stringop-overflow warning

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79095

--- Comment #12 from Jeffrey A. Law <law at redhat dot com> ---
With the v.size() > 0 guard enabled and my VRP tweaks I get no warnings.  Plan
is to either polish up the VRP tweaks or turn them into a match.pd pattern. 
Not sure which is going to be better yet.