[Bug rtl-optimization/57359] wrong code for union access at -O3 on x86_64-linux

[dhazeghi at yahoo dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57359

--- Comment #3 from Dara Hazeghi <dhazeghi at yahoo dot com> ---
My apologies for the invalid report and thank you for the clear explanation. 
I've been using frama-c to check validity of the testcases, but clearly in this
case it's not sufficient.