Merge pull request #84 from ex-bart/fix-simd-reference-swap-args

[parallel.simd.reference] Fix swap value_type params to be lvalues

Author: jaredhoberock

src/simd.tex

@@ -823,8 +823,8 @@
   value_type operator--(int) && noexcept;
 
   friend void swap(reference&& a, reference&& b) noexcept;
-  friend void swap(value_type&& a, reference&& b) noexcept;
-  friend void swap(reference&& a, value_type&& b) noexcept;
+  friend void swap(value_type& a, reference&& b) noexcept;
+  friend void swap(reference&& a, value_type& b) noexcept;
 };
 \end{codeblock}