Fix SH4 build (broken since r148639).
https://bugs.webkit.org/show_bug.cgi?id=114773.

Allow longer displacements for specific branches in SH4 LLINT.

Patch by Julien Brianceau <jbrianceau@nds.com> on 2013-04-17
Reviewed by Oliver Hunt.

* offlineasm/sh4.rb:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148653 268f45cc-cd09-0410-ab3c-d52691b4dbfc