REGRESSION(r149114): cache flush for SH4 arch may flush an extra page.
https://bugs.webkit.org/show_bug.cgi?id=115305

Patch by Julien Brianceau <jbrianceau@nds.com> on 2013-04-27
Reviewed by Andreas Kling.

* assembler/SH4Assembler.h:
(JSC::SH4Assembler::cacheFlush):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149240 268f45cc-cd09-0410-ab3c-d52691b4dbfc