[Bug libgomp/59546] wrong behavior with reduction

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59546

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
i is uninitialized before the reduction, so if you add some number of threads
to an uninitialized value, you can get pretty much anything.

Also, there is no guarantee !$omp parallel will create exactly
omp_get_max_threads () threads, that is just maximum for the number of threads,
it can depend on env vars etc.