[patch] Refactor duplicated code into a helper function

[Rafael Espíndola]

The attached patch refactors a bit of duplicated code into a helper
function. It will make it easier to handle both cases when gcing parts
of mergeable sections.

This includes a mini bug fix in that an unaligned string that is also
not null terminated is reported as unaligned.

2014-09-18  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>
  * merge.h (add_string): declare.
  * merge.cc (add_string): define.
   (do_add_input_section): use add_string.

Cheers,
Rafael
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