Windows/64bit?: tst_QThreadPool frequently fails in the CI

	C:\utils\jom\jom.exe -f Makefile.Release check
 	(set QT_PLUGIN_PATH=C:\Users\qt\work\qt\qtbase\plugins) & (set PATH=C:\Users\qt\work\qt\qtbase\lib;%%PATH:)=^)%%) &  release\tst_qthreadpool.exe -o c:\Users\qt\work\testresults\tests\auto\corelib\thread\qthreadpool037690577,xml -o -,txt
 ********* Start testing of tst_QThreadPool *********
 Config: Using QtTest library 5.6.0, Qt 5.6.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2013)
 PASS   : tst_QThreadPool::initTestCase()
 PASS   : tst_QThreadPool::runFunction()
 PASS   : tst_QThreadPool::createThreadRunFunction()
 PASS   : tst_QThreadPool::runMultiple()
 PASS   : tst_QThreadPool::waitcomplete()
 PASS   : tst_QThreadPool::runTask()
 PASS   : tst_QThreadPool::singleton()
 PASS   : tst_QThreadPool::destruction()
 PASS   : tst_QThreadPool::threadRecycling()
 PASS   : tst_QThreadPool::expiryTimeout()
 SKIP   : tst_QThreadPool::expiryTimeoutRace() This test is unstable on Windows. See QTBUG-3786.
 tst_qthreadpool.cpp(368) : failure location
 PASS   : tst_QThreadPool::exceptions()
 PASS   : tst_QThreadPool::setMaxThreadCount(1)
 PASS   : tst_QThreadPool::setMaxThreadCount(-1)
 PASS   : tst_QThreadPool::setMaxThreadCount(2)
 PASS   : tst_QThreadPool::setMaxThreadCount(-2)
 PASS   : tst_QThreadPool::setMaxThreadCount(4)
 PASS   : tst_QThreadPool::setMaxThreadCount(-4)
 PASS   : tst_QThreadPool::setMaxThreadCount(0)
 PASS   : tst_QThreadPool::setMaxThreadCount(12345)
 PASS   : tst_QThreadPool::setMaxThreadCount(-6789)
 PASS   : tst_QThreadPool::setMaxThreadCount(42)
 PASS   : tst_QThreadPool::setMaxThreadCount(-666)
 PASS   : tst_QThreadPool::setMaxThreadCountStartsAndStopsThreads()
 PASS   : tst_QThreadPool::reserveThread(1)
 PASS   : tst_QThreadPool::reserveThread(-1)
 PASS   : tst_QThreadPool::reserveThread(2)
 PASS   : tst_QThreadPool::reserveThread(-2)
 PASS   : tst_QThreadPool::reserveThread(4)
 PASS   : tst_QThreadPool::reserveThread(-4)
 PASS   : tst_QThreadPool::reserveThread(0)
 PASS   : tst_QThreadPool::reserveThread(12345)
 PASS   : tst_QThreadPool::reserveThread(-6789)
 PASS   : tst_QThreadPool::reserveThread(42)
 PASS   : tst_QThreadPool::reserveThread(-666)
 PASS   : tst_QThreadPool::releaseThread(1)
 PASS   : tst_QThreadPool::releaseThread(-1)
 PASS   : tst_QThreadPool::releaseThread(2)
 PASS   : tst_QThreadPool::releaseThread(-2)
 PASS   : tst_QThreadPool::releaseThread(4)
 PASS   : tst_QThreadPool::releaseThread(-4)
 PASS   : tst_QThreadPool::releaseThread(0)
 PASS   : tst_QThreadPool::releaseThread(12345)
 PASS   : tst_QThreadPool::releaseThread(-6789)
 PASS   : tst_QThreadPool::releaseThread(42)
 PASS   : tst_QThreadPool::releaseThread(-666)
 PASS   : tst_QThreadPool::reserveAndStart()
 PASS   : tst_QThreadPool::start()
 PASS   : tst_QThreadPool::tryStart()
 PASS   : tst_QThreadPool::tryStartPeakThreadCount()
 FAIL!  : tst_QThreadPool::tryStartCount() Compared values are not the same
    Actual   (count)                      : 0
    Expected (QThread::idealThreadCount()): 4
 tst_qthreadpool.cpp(822) : failure location
 PASS   : tst_QThreadPool::priorityStart(0)
 PASS   : tst_QThreadPool::priorityStart(1)
 PASS   : tst_QThreadPool::priorityStart(2)
 PASS   : tst_QThreadPool::waitForDone()
 PASS   : tst_QThreadPool::clear()
 PASS   : tst_QThreadPool::cancel()
 PASS   : tst_QThreadPool::waitForDoneTimeout()
 PASS   : tst_QThreadPool::destroyingWaitsForTasksToFinish()
 PASS   : tst_QThreadPool::stressTest()
 PASS   : tst_QThreadPool::cleanupTestCase()
 Totals: 59 passed, 1 failed, 1 skipped, 0 blacklisted
 ********* Finished testing of tst_QThreadPool *********