simdize: use make_tuple instead of tie

The tuple_size initializer doesn't have a this pointer, so EDG seems to
be right about complaining that std::tie can't work here.
std::make_tuple OTOH still works, so let's go with that instead. All we
need to know is the number of elements, anyway.

Refs: gh-119
Signed-off-by: Matthias Kretz <kretz@kde.org>

common/simdize.h

@@ -1772,7 +1772,7 @@ using simdize = SimdizeDetail::simdize<T, N, MT>;
         return std::get<N_>(std::tie MEMBERS_);                                          \
     }                                                                                    \
     enum : std::size_t {                                                                 \
-        tuple_size = std::tuple_size<decltype(std::tie MEMBERS_)>::value                 \
+        tuple_size = std::tuple_size<decltype(std::make_tuple MEMBERS_)>::value          \
     }
 
 }  // namespace Vc