Upstream utilities for iOS

ios/chrome/browser/arch_util.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ios/chrome/browser/arch_util.h"
+
+namespace arch_util {
+
+// const char[] can be initialized only with literal.
+#define _ARM_ARCH "arm"
+#define _ARM_64_ARCH "arm64"
+
+const char kARMArch[] = _ARM_ARCH;
+
+const char kARM64Arch[] = _ARM_64_ARCH;
+
+#if defined(__LP64__)
+const char kCurrentArch[] = _ARM_64_ARCH;
+#else
+const char kCurrentArch[] = _ARM_ARCH;
+#endif
+
+}  // namespace arch_util