tcg: don't remove op if output needs to be synced to memory

Commit 9c43b68d do not correctly check
for dead outputs when they need to be synced to memory in case of
half-dead operations.

Fix that by applying the same pattern than for the default case.
Tested-by: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

tcg/tcg.c

@@ -1329,8 +1329,8 @@ static void tcg_liveness_analysis(TCGContext *s)
                the low part.  The result can be optimized to a simple
                add or sub.  This happens often for x86_64 guest when the
                cpu mode is set to 32 bit.  */
-            if (dead_temps[args[1]]) {
-                if (dead_temps[args[0]]) {
+            if (dead_temps[args[1]] && !mem_temps[1]) {
+                if (dead_temps[args[0]] && !mem_temps[0]) {
                     goto do_remove;
                 }
                 /* Create the single operation plus nop.  */
@@ -1355,8 +1355,8 @@ static void tcg_liveness_analysis(TCGContext *s)
             nb_iargs = 2;
             nb_oargs = 2;
             /* Likewise, test for the high part of the operation dead.  */
-            if (dead_temps[args[1]]) {
-                if (dead_temps[args[0]]) {
+            if (dead_temps[args[1]] && !mem_temps[1]) {
+                if (dead_temps[args[0]] && !mem_temps[0]) {
                     goto do_remove;
                 }
                 gen_opc_buf[op_index] = op = INDEX_op_mul_i32;