Changed __config to react to all of clang's currently documented has_feature flags, and renamed _LIBCPP_MOVE to _LIBCPP_HAS_NO_RVALUE_REFERENCES to be more consistent with the rest of the libc++'s flags, and with clang's nomenclature.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@113086 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/utility b/include/utility
index 0aa66e6..ccf20a7 100644
--- a/include/utility
+++ b/include/utility
@@ -171,14 +171,14 @@
 
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
-#ifdef _LIBCPP_MOVE
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 typename conditional
 <
     !has_nothrow_move_constructor<_Tp>::value && has_copy_constructor<_Tp>::value,
     const _Tp&,
     _Tp&&
 >::type
-#else  // _LIBCPP_MOVE
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 const _Tp&
 #endif
 move_if_noexcept(_Tp& __x)
@@ -207,7 +207,7 @@
     _LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
         : first(__x), second(__y) {}
 
-#ifdef _LIBCPP_MOVE
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
     template <class _U1, class _U2,
               class = typename enable_if<is_convertible<_U1, first_type >::value &&
@@ -253,11 +253,11 @@
 
 #endif  // _LIBCPP_HAS_NO_VARIADICS
 
-#else  // _LIBCPP_MOVE
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     template<class _U1, class _U2>
         _LIBCPP_INLINE_VISIBILITY pair(const pair<_U1, _U2>& __p)
             : first(__p.first), second(__p.second) {}
-#endif  // _LIBCPP_MOVE
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     void _LIBCPP_INLINE_VISIBILITY swap(pair& __p) {_STD::swap(*this, __p);}
 private:
 
@@ -326,7 +326,7 @@
     swap(__x.second, __y.second);
 }
 
-#ifdef _LIBCPP_MOVE
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
 template <class _Tp> class reference_wrapper;
 
@@ -357,7 +357,7 @@
                (_STD::forward<_T1>(__t1), _STD::forward<_T2>(__t2));
 }
 
-#else  // _LIBCPP_MOVE
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -367,7 +367,7 @@
     return pair<_T1, _T2>(__x, __y);
 }
 
-#endif  // _LIBCPP_MOVE
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
 #ifndef _LIBCPP_HAS_NO_VARIADICS