[range.common.view] Declare size after begin/end like in the other views (#3598)

Author: JohelEGP

source/ranges.tex

@@ -5802,13 +5802,6 @@
     constexpr V base() const& requires copy_constructible<V> { return @\exposid{base_}@; }
     constexpr V base() && { return std::move(@\exposid{base_}@); }
 
-    constexpr auto size() requires sized_range<V> {
-      return ranges::size(@\exposid{base_}@);
-    }
-    constexpr auto size() const requires sized_range<const V> {
-      return ranges::size(@\exposid{base_}@);
-    }
-
     constexpr auto begin() {
       if constexpr (random_access_range<V> && sized_range<V>)
         return ranges::begin(@\exposid{base_}@);
@@ -5836,6 +5829,13 @@
       else
         return common_iterator<iterator_t<const V>, sentinel_t<const V>>(ranges::end(@\exposid{base_}@));
     }
+
+    constexpr auto size() requires sized_range<V> {
+      return ranges::size(@\exposid{base_}@);
+    }
+    constexpr auto size() const requires sized_range<const V> {
+      return ranges::size(@\exposid{base_}@);
+    }
   };
 
   template<class R>