[Bug tree-optimization/69489] missed vectorization for boolean loop, missed if-conversion

[jtaylor.debian at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69489

--- Comment #12 from Julian Taylor <jtaylor.debian at googlemail dot com> ---
the testcase in this ticket is not yet vectorized with gcc 20160421 (r235341)