Changing <atomic> to follow Design A

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@116742 91177308-0d34-0410-b5e6-96231b3b80d8

src/atomic.cpp

@@ -1,23 +0,0 @@
-//===------------------------- atomic.cpp ---------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "__mutex_base"
-#include "atomic"
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-_LIBCPP_VISIBLE
-mutex&
-__not_atomic_mut()
-{
-    static mutex m;
-    return m;
-}
-
-_LIBCPP_END_NAMESPACE_STD