[PATCH] [libcxx] Add <experimental/tuple>

[Marshall Clow]

This looks good to me.


================
Comment at: include/experimental/tuple:53
@@ +52,3 @@
+
+#if __has_feature(cxx_variable_templates)
+template <class _Tp>
----------------
I just added a new config macro: `_LIBCPP_HAS_NO_VARIABLE_TEMPLATES`
Please use that instead.

http://reviews.llvm.org/D7354

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/