[Bug tree-optimization/68324] [6 Regression] ICE on valid code at -O3 on x86_64-linux-gnu

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68324

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Also seen on x86_64-apple-darwin14. Revision r230007 is OK, r230269 gives the
ICE.