QTimerInfo: refactor QTimerInfo

- Add a constructor
- Initialize members in-class
- Reorder the data members so as not to waste space between them, now
  all the padding is at the end

Change-Id: Ic88200fbff049615a6a43e322e724cf619fc3cdb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qtimerinfo_unix.cpp

@@ -285,12 +285,7 @@ void QTimerInfoList::registerTimer(int timerId, qint64 interval, Qt::TimerType t
 void QTimerInfoList::registerTimer(int timerId, milliseconds interval,
                                    Qt::TimerType timerType, QObject *object)
 {
-    QTimerInfo *t = new QTimerInfo;
-    t->id = timerId;
-    t->interval = interval;
-    t->timerType = timerType;
-    t->obj = object;
-    t->activateRef = nullptr;
+    QTimerInfo *t = new QTimerInfo(timerId, interval, timerType, object);
 
     steady_clock::time_point expected = updateCurrentTime() + interval;
 

src/corelib/kernel/qtimerinfo_unix_p.h

@@ -26,12 +26,17 @@ QT_BEGIN_NAMESPACE
 
 // internal timer info
 struct QTimerInfo {
-    int id;           // - timer identifier
-    Qt::TimerType timerType; // - timer type
-    std::chrono::milliseconds interval; // - timer interval
+    QTimerInfo(int timerId, std::chrono::milliseconds msecs, Qt::TimerType type, QObject *obj)
+        : interval(msecs), id(timerId), timerType(type), obj(obj)
+    {
+    }
+
     std::chrono::steady_clock::time_point timeout; // - when to actually fire
-    QObject *obj;     // - object to receive event
-    QTimerInfo **activateRef; // - ref from activateTimers
+    std::chrono::milliseconds interval = std::chrono::milliseconds{-1}; // - timer interval
+    int id = -1; // - timer identifier
+    Qt::TimerType timerType; // - timer type
+    QObject *obj = nullptr; // - object to receive event
+    QTimerInfo **activateRef = nullptr; // - ref from activateTimers
 };
 
 class Q_CORE_EXPORT QTimerInfoList