semaphore_test.cc: re-enable MultithreadedStressTest (#1036)
semaphore_test.cc: re-enable MultithreadedStressTest (#1036)


firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk