[Bug target/69789] g++ -O2 is removing tests against a variable that can be changed

[spam.gcc at klub dot com.pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69789

Tomek Mrugalski <spam.gcc at klub dot com.pl> changed:

           What    |Removed                     |Added
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                 CC|                            |spam.gcc at klub dot com.pl

--- Comment #6 from Tomek Mrugalski <spam.gcc at klub dot com.pl> ---
This issue manifests itself also on g++ 5.4.0, the default compiler in Ubuntu
16.04. Exact version: (Ubuntu 5.4.0-6ubuntu1~16.04.2) 5.4.0 20160609.