Make QThreadPoolPrivate use NSDMIs

(non static data member initializers)

Also, taking the absolute value of the idealThreadCount()
return value is no longer needed since the function now
returns 1 for the "CPU detection failure" case.

Change-Id: I2214fd15ed24413bba796ead38bbf1355dfd37d9
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/corelib/thread/qthreadpool.cpp

@@ -154,11 +154,6 @@ void QThreadPoolThread::registerThreadInactive()
     \internal
 */
 QThreadPoolPrivate:: QThreadPoolPrivate()
-    : isExiting(false),
-      expiryTimeout(30000),
-      maxThreadCount(qAbs(QThread::idealThreadCount())),
-      reservedThreads(0),
-      activeThreads(0)
 { }
 
 bool QThreadPoolPrivate::tryStart(QRunnable *task)

src/corelib/thread/qthreadpool_p.h

@@ -53,6 +53,7 @@
 //
 
 #include "QtCore/qmutex.h"
+#include "QtCore/qthread.h"
 #include "QtCore/qwaitcondition.h"
 #include "QtCore/qset.h"
 #include "QtCore/qqueue.h"
@@ -91,11 +92,11 @@ public:
     QVector<QPair<QRunnable *, int> > queue;
     QWaitCondition noActiveThreads;
 
-    bool isExiting;
-    int expiryTimeout;
-    int maxThreadCount;
-    int reservedThreads;
-    int activeThreads;
+    int expiryTimeout = 30000;
+    int maxThreadCount = QThread::idealThreadCount();
+    int reservedThreads = 0;
+    int activeThreads = 0;
+    bool isExiting = false;
 };
 
 QT_END_NAMESPACE