[gold][patch] Avoid looking up Input_merge_map multiple times

[Rafael Espíndola]

A rebased patch is attached.

This is the last refactoring before the gc implementation.

On 9 February 2015 at 14:19, Rafael Espíndola
<rafael.espindola@gmail.com> wrote:
> The attached patch (which applies on top of my previous one) avoid
> looking up Input_merge_map multiple times when we know were are
> processing items from the same input section.
>
> Cheers,
> Rafael
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