libstdc++: Add missing noexcept to std::variant helper

libstdc++-v3/ChangeLog:

	* include/std/variant (__detail::__variant::__as): Add missing
	noexcept to first overload.

(cherry picked from commit 728e639d82099035fdfe69b716a54717ae7050e0)

diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index 769b4682bb75855ebbd50e43bc764317d7465bc8..c0585cb5999a0f9dc2264a67c7d553c6039466f9 100644 (file)
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -206,7 +206,7 @@ namespace __variant
 
   template<typename... _Types>
     constexpr std::variant<_Types...>&
-    __as(std::variant<_Types...>& __v)
+    __as(std::variant<_Types...>& __v) noexcept
     { return __v; }
 
   template<typename... _Types>