fix benchmark by waiting and not dropping barrier in aggrj

qdp_project/src/Benchmark.cpp

@@ -126,7 +126,7 @@ void aggr_j(size_t gid, size_t tid) {
 
     THREAD_TIMING_[AGGRJ_TIMING_INDEX][UniqueIndex(gid,tid)][0][TIME_STAMP_BEGIN] = std::chrono::steady_clock::now();
 
-    BARRIERS_[gid]->arrive_and_drop();
+    BARRIERS_[gid]->arrive_and_wait();
 
     THREAD_TIMING_[AGGRJ_TIMING_INDEX][UniqueIndex(gid,tid)][0][TIME_STAMP_WAIT] = std::chrono::steady_clock::now();