[Bug sanitizer/62216] UBSan can read past valid memory region

[y.gribov at samsung dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62216

--- Comment #3 from Yury Gribov <y.gribov at samsung dot com> ---
Reported upstream: http://llvm.org/bugs/show_bug.cgi?id=20721