target-arm: explicitly decode SEVL instruction

The ARMv8 SEVL instruction is in the architectural hint space already
emulated as nop.  This makes the decoding of SEVL explicit for clarity.
Signed-off-by: NMans Rullgard <mans@mansr.com>
Message-id: 1370606786-5650-3-git-send-email-mans@mansr.com
[PMM: added 'SEVL' to the TODO comment]
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target-arm/translate.c

@@ -3501,7 +3501,8 @@ static void gen_nop_hint(DisasContext *s, int val)
         break;
     case 2: /* wfe */
     case 4: /* sev */
-        /* TODO: Implement SEV and WFE.  May help SMP performance.  */
+    case 5: /* sevl */
+        /* TODO: Implement SEV, SEVL and WFE.  May help SMP performance.  */
     default: /* nop */
         break;
     }