Provide a move(const T&) overload for C++03 mode to enable moving from rvalues.  This is to support proxy references.  Fixes r10858112.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@150488 91177308-0d34-0410-b5e6-96231b3b80d8

include/type_traits

diff --git a/include/type_traits b/include/type_traits
index 924a602..5911c03 100644
--- a/include/type_traits
+++ b/include/type_traits
@@ -1322,6 +1322,18 @@
 inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if
 <
+    !is_convertible<_Tp, __rv<_Tp> >::value,
+    const _Tp&
+>::type
+move(const _Tp& __t)
+{
+    return __t;
+}
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+typename enable_if
+<
     is_convertible<_Tp, __rv<_Tp> >::value,
     _Tp
 >::type