Fix INFO commandstats reporting when argv is rewritten.

We want to report the original command in the stats, for example GEOADD,
even when what is actually executed is the ZADD implementation.

src/scripting.c

@@ -463,7 +463,7 @@ int luaRedisGenericCommand(lua_State *lua, int raise_error) {
             luaPushError(lua,"Unknown Redis command called from Lua script");
         goto cleanup;
     }
-    c->cmd = cmd;
+    c->cmd = c->lastcmd = cmd;
 
     /* There are commands that are not allowed inside scripts. */
     if (cmd->flags & CMD_NOSCRIPT) {

src/server.c

@@ -2245,8 +2245,8 @@ void call(client *c, int flags) {
         slowlogPushEntryIfNeeded(c->argv,c->argc,duration);
     }
     if (flags & CMD_CALL_STATS) {
-        c->cmd->microseconds += duration;
-        c->cmd->calls++;
+        c->lastcmd->microseconds += duration;
+        c->lastcmd->calls++;
     }
 
     /* Propagate the command into the AOF and replication link */