Remove unnecessary break-after-return in switch statement

BUG=v8:1642

Review URL: http://codereview.chromium.org/7781007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9043 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/elements.cc

@@ -590,7 +590,6 @@ ElementsAccessor* ElementsAccessor::ForArray(FixedArrayBase* array) {
     default:
       UNREACHABLE();
       return NULL;
-      break;
   }
 }