Add a test for the new CRYPTO_atomic_* functions
Add a test for the new CRYPTO_atomic_* functions

Also tests the older CRYPTO_atomic_add() which was without a test

Reviewed-by: Dmitry Belyavskiy <38c64d6e24766247aad56af3a6ddb0056ad36a44@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/13733)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl