[lto][patch] Add initial gold plugin

[Rafael Espindola]

> Since you are making other use of libtool here, I suggest using its
> support for dynamic loading (with libltdl when necessary) rather than
> hardcoding -ldl and so restricting the supported hosts arbitrarily.  (I
> have not looked at the details of how or why -ldl is being used.)

This is a lto plugin for Gold. I don't think using -ldl is limiting
the supported platforms. I can change that in the future, but get it
working is a bigger priority.

> --
> Joseph S. Myers
> joseph@codesourcery.com
>


Cheers,
-- 
Rafael Avila de Espindola

Google | Gordon House | Barrow Street | Dublin 4 | Ireland
Registered in Dublin, Ireland | Registration Number: 368047