Follow-up for r289831: Lower the unjoined thread count to 100 in the libcxx-future.mm testcase.

Turns out 1000 unjoined threads are a bit too rough in certain environments.

llvm-svn: 289971

compiler-rt/test/tsan/Darwin/libcxx-future.mm

@@ -12,7 +12,7 @@ int main(int argc, const char *argv[]) {
 
   std::vector<std::thread> threads;
 
-  for (int i = 0; i < 1000; i++) {
+  for (int i = 0; i < 100; i++) {
     std::packaged_task<int(void)> task(my_task);
     std::future<int> future = task.get_future();
     threads.push_back(std::thread(std::move(task)));