CBD-6348: C++20 std::memory_order namespace is gone

Change-Id: Ib5caa64961ccd33d5fb36fc2584db4796f118d58
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/234573
Well-Formed: Restriction Checker
Reviewed-by: Faizan Alam <[email protected]>
Tested-by: Trond Norbye <[email protected]>

Author: trondn

daemon/stats.h

@@ -167,14 +167,14 @@ struct stats {
     std::atomic<unsigned int> curr_conns;
 
     size_t getCurrConnections() const {
-        return curr_conns.load(std::memory_order::memory_order_consume);
+        return curr_conns.load(std::memory_order_consume);
     }
 
     /// The number of system connections
     std::atomic<unsigned int> system_conns;
 
     size_t getSystemConnections() const {
-        return system_conns.load(std::memory_order::memory_order_consume);
+        return system_conns.load(std::memory_order_consume);
     }
 
     size_t getUserConnections() const {

engines/ep/src/durability_timeout_task.h

@@ -56,7 +56,7 @@ class DurabilityTimeoutTask : public GlobalTask {
     // has its internal sleep-time which is used for a different purpose,
     // details in VBCBAdaptor.
     cb::AtomicDuration<std::chrono::milliseconds,
-                       std::memory_order::memory_order_seq_cst>
+                       std::memory_order_seq_cst>
             sleepTime;
 };