Fix inc8 and dec8 operations, by Magnus Damm.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2731 c046a42c-6fe2-441c-8c8c-71466251a162

target-sh4/op.c

@@ -737,7 +737,7 @@ void OPPROTO op_dec4_rN(void)
 
 void OPPROTO op_dec8_rN(void)
 {
-    env->gregs[PARAM1] -= 4;
+    env->gregs[PARAM1] -= 8;
     RETURN();
 }
 
@@ -761,7 +761,7 @@ void OPPROTO op_inc4_rN(void)
 
 void OPPROTO op_inc8_rN(void)
 {
-    env->gregs[PARAM1] += 4;
+    env->gregs[PARAM1] += 8;
     RETURN();
 }