[patch] Simplify Garbage_collection::add_reference a bit

[Rafael Espíndola]

this->section_reloc_map_[src_id] is created if it doesn't exist, so there
is no point in doing a find.

Cheers,
Rafael

2014-09-18  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>
       * gc.h (Garbage_collection::add_reference): Don't use find.
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