[libcxx] Reorder the two u8path functions, to make the following diff more readable. NFC.

Differential Revision: https://reviews.llvm.org/D91136

Author: mstorsjo

libcxx/include/filesystem

@@ -1362,20 +1362,6 @@ inline _LIBCPP_INLINE_VISIBILITY void swap(path& __lhs, path& __rhs) noexcept {
 _LIBCPP_FUNC_VIS
 size_t hash_value(const path& __p) noexcept;
 
-template <class _Source>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
-    typename enable_if<__is_pathable<_Source>::value, path>::type
-    u8path(const _Source& __s) {
-  static_assert(
-#ifndef _LIBCPP_NO_HAS_CHAR8_T
-      is_same<typename __is_pathable<_Source>::__char_type, char8_t>::value ||
-#endif
-      is_same<typename __is_pathable<_Source>::__char_type, char>::value,
-      "u8path(Source const&) requires Source have a character type of type "
-      "'char' or 'char8_t'");
-  return path(__s);
-}
-
 template <class _InputIt>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
     typename enable_if<__is_pathable<_InputIt>::value, path>::type
@@ -1390,6 +1376,20 @@ _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
   return path(__f, __l);
 }
 
+template <class _Source>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_WITH_CHAR8_T
+    typename enable_if<__is_pathable<_Source>::value, path>::type
+    u8path(const _Source& __s) {
+  static_assert(
+#ifndef _LIBCPP_NO_HAS_CHAR8_T
+      is_same<typename __is_pathable<_Source>::__char_type, char8_t>::value ||
+#endif
+      is_same<typename __is_pathable<_Source>::__char_type, char>::value,
+      "u8path(Source const&) requires Source have a character type of type "
+      "'char' or 'char8_t'");
+  return path(__s);
+}
+
 class _LIBCPP_TYPE_VIS path::iterator {
 public:
   enum _ParserState : unsigned char {