[lto][patch] Don't write DECL_ABSTRACT_ORIGIN

[Rafael Espindola]

> Right but isn't this needed for good debugging information?  This is why it
> was pointing to a result decl :).

The plan is to generate debug info (in some currently undecided form)
early. Cary posted an initial design. We drop from the IL proper
anything we don't need for code generation.

Cheers,
-- 
Rafael Avila de Espindola

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