Public bug reported:
Inspired by the following blog post:
http://codeforces.com/blog/entry/50291
Attached file is a snippet of code which, when compiled with `g++ a.cpp`
produces an executable `a.out`, which runs correctly. But when compiled
with `g++ a.cpp -O1` the resulting executable crashes i
Sidenote: we were unable to reproduce that bug on:
1. Ideone (they claim to use GCC 5.1, but do not specify which flavor it is).
2. tdm-gcc 5.1.0 on Windows.
3. gcc version 6.1.0 (Gentoo 6.1.0 p1.0)
And we were able to reproduce it on (in addition to what's mentioned in the
report):
1. g++ (Ubunt
