[atomics.syn] Move namespace-scope memory_order_* variables here

Author: jensmaurer

source/threads.tex

@@ -2049,6 +2049,13 @@
 namespace std {
   // \ref{atomics.order}, order and consistency
   enum class memory_order : @\unspec@;                                            // freestanding
+  inline constexpr memory_order memory_order_relaxed = memory_order::relaxed;
+  inline constexpr memory_order memory_order_consume = memory_order::consume;
+  inline constexpr memory_order memory_order_acquire = memory_order::acquire;
+  inline constexpr memory_order memory_order_release = memory_order::release;
+  inline constexpr memory_order memory_order_acq_rel = memory_order::acq_rel;
+  inline constexpr memory_order memory_order_seq_cst = memory_order::seq_cst;
+
   template<class T>
     T kill_dependency(T y) noexcept;                                                // freestanding
 }
@@ -2415,12 +2422,6 @@
   enum class memory_order : @\unspec@ {
     relaxed, consume, acquire, release, acq_rel, seq_cst
   };
-  inline constexpr memory_order memory_order_relaxed = memory_order::relaxed;
-  inline constexpr memory_order memory_order_consume = memory_order::consume;
-  inline constexpr memory_order memory_order_acquire = memory_order::acquire;
-  inline constexpr memory_order memory_order_release = memory_order::release;
-  inline constexpr memory_order memory_order_acq_rel = memory_order::acq_rel;
-  inline constexpr memory_order memory_order_seq_cst = memory_order::seq_cst;
 }
 \end{codeblock}