Specify memory ordering

VersionedMap.cpp

@@ -303,21 +303,21 @@ int main() {
     auto x = mm.allocate();
     mm.base[x].pointers[0] = 0;
     mm.base[x].pointers[1] = 0;
-    mm.base[x].updated.store(false);
+    mm.base[x].updated.store(false, std::memory_order_relaxed);
   });
   mm.gc(nullptr, 0, 0);
   for (int i = 0; i < 10000; ++i) {
     auto x = mm.allocate();
     mm.base[x].pointers[0] = 0;
     mm.base[x].pointers[1] = 0;
-    mm.base[x].updated.store(false);
+    mm.base[x].updated.store(false, std::memory_order_relaxed);
   }
   auto root = mm.allocate();
   mm.base[root].entry = weaselab::Entry::make(0, nullptr, 0, nullptr, 0,
                                               weaselab::VersionedMap::Set);
   mm.base[root].pointers[0] = 0;
   mm.base[root].pointers[1] = 0;
-  mm.base[root].updated.store(false);
+  mm.base[root].updated.store(false, std::memory_order_relaxed);
   bench.run("gc", [&]() { mm.gc(&root, 1, 0); });
 }
 #endif