[Bug c++/57644] [C++1y] Cannot bind bitfield to lvalue reference

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57644

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And with the released 4.9.0 too. We should add the testcase and close it.