[lto plugin][patch] pass input files to the linker + bug fixes

[Rafael Espindola]

The attached patch fixes some bugs and passes the input files back to
the linker. This is a quick hack that is useful for testing before I
implement wpa invocation (next patch).

With this patch I was able to link and run a small program :-)

Cheers,
-- 
Rafael Avila de Espindola

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