Add tests for unordered container tests and std::string

llvm-svn: 290655
diff --git a/libcxx/include/unordered_map b/libcxx/include/unordered_map
index 50be81e..dc8db80 100644
--- a/libcxx/include/unordered_map
+++ b/libcxx/include/unordered_map
@@ -1099,7 +1099,7 @@
     _LIBCPP_INLINE_VISIBILITY
     void swap(unordered_map& __u)
         _NOEXCEPT_(__is_nothrow_swappable<__table>::value)
-        {__table_.swap(__u.__table_);}
+        { __table_.swap(__u.__table_);}
 
     _LIBCPP_INLINE_VISIBILITY
     hasher hash_function() const