[1/16][binutils][AARCH64]Add relocation support for large memory model. [BFD] simply refactor to facilitate further patch.

[Renlin Li]

Hi all,

This is a simple refactor patch to change if to switch statement to 
facilitate new relocation support added later.

Okay to commit?

bfd/ChangeLog:

2015-09-08  Renlin Li  <renlin.li@arm.com>

     * elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Change if to
         switch statement.
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