version typeinfo for 128bit types

[Jonathan Wakely]

On 14 April 2014 10:39, Marc Glisse wrote:
>
>         PR libstdc++/43622
>         * config/abi/pre/gnu.ver (CXXABI_1.3.9): New version, new symbols.
>         * config/abi/pre/gnu-versioned-namespace.ver: New symbols.
>         * config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Likewise.

I'd like to wait until 4.9.0 has been released before adding new
versions to the library, to avoid unnecessary differences between
trunk and the 4.9.0 release candidate(s).