Upstream utilities for iOS

ios/chrome/browser/arch_util.cc

Index: ios/chrome/browser/arch_util.cc
diff --git a/ios/chrome/browser/arch_util.cc b/ios/chrome/browser/arch_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eb0111b8278c7f5ac228edff06b9012b1602a6f6
--- /dev/null
+++ b/ios/chrome/browser/arch_util.cc
@@ -0,0 +1,23 @@
+// 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