target-m68k: CAS doesn't need aligned access

Signed-off-by: NLaurent Vivier <laurent@vivier.eu>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Message-Id: <1484332593-16782-5-git-send-email-laurent@vivier.eu>

target/m68k/translate.c

@@ -1934,7 +1934,6 @@ DISAS_INSN(cas)
     default:
         g_assert_not_reached();
     }
-    opc |= MO_ALIGN;
 
     ext = read_im16(env, s);