[PATCH] Add a test for std::condition_variable_any

[Jonathan Wakely]

On 26/07/18 16:03 -0400, Marek Polacek wrote:
>We've been carrying this test internally for quite some time and I think it
>would be beneficial for everyone to include it in the upstream testsuite, too.
>
>Tested on x86_64-linux, ok for trunk and 8.3?

OK.

(Although as I said on internal IRC, I don't think this has ever
failed with any upstream GCC version. It only fails when mixing
versions, which is a case that never gets tested by dejagnu).