[Bug c++/64318] Using _Cilk_for with <random> cause strange floating point exception

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64318

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The original testcase does indeed have a data race. The revised testcase is
valid.