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.

llvm-svn: 113086
diff --git a/libcxx/test/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp b/libcxx/test/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp
index cbcbfb4..b42e431 100644
--- a/libcxx/test/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp
+++ b/libcxx/test/input.output/string.streams/stringstream.cons/stringstream.assign/move.pass.cpp
@@ -19,7 +19,7 @@
 
 int main()
 {
-#ifdef _LIBCPP_MOVE
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     {
         std::stringstream ss0(" 123 456 ");
         std::stringstream ss;
@@ -50,5 +50,5 @@
         ss << i << ' ' << 123;
         assert(ss.str() == L"456 1236 ");
     }
-#endif  // _LIBCPP_MOVE
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 }