tst_qquickdesignersupport: tests segfault when running on QEMU and Windows MinGW developer build

#0  0x3f5eccde in QtPrivate::indexOf<QObject*, QObject*> (from=0, u=<synthetic pointer>: 0x4004b888, vector=...) at /home/qt/work/install/target/include/QtCore/qlist.h:177                                                                                                    
#1  QListSpecialMethodsBase<QObject*>::indexOf<QObject*> (from=0, t=<synthetic pointer>: 0x4004b888, this=0x3fffdf28) at /home/qt/work/install/target/include/QtCore/qlist.h:882                                                                                               
#2  QListSpecialMethodsBase<QObject*>::contains<QObject*> (t=<synthetic pointer>: 0x4004b888, this=0x3fffdf28) at /home/qt/work/install/target/include/QtCore/qlist.h:80                                                                                                       
#3  QQuickDesignerSupportProperties::propertyNameListForWritableProperties (object=0x4004b888, baseName=..., inspectedObjects=0x3fffdf28, inspectedObjects@entry=0x0) at /home/qt/work/qt/qtdeclarative/src/quick/designer/qquickdesignersupportproperties.cpp:140             
#4  0x3f5e536c in QQuickDesignerCustomObjectData::populateResetHashes (this=this@entry=0x400df390) at /home/qt/work/install/target/include/QtCore/qarraydatapointer.h:63                                                                                                       
#5  0x3f5e55e2 in QQuickDesignerCustomObjectData::QQuickDesignerCustomObjectData (this=0x400df390, object=0x4004b888) at /home/qt/work/qt/qtdeclarative/src/quick/designer/qquickdesignercustomobjectdata.cpp:65                                                               
#6  0x4001449e in tst_qquickdesignersupport::testSimpleBindings (this=<optimized out>) at /home/qt/work/qt/qtdeclarative/tests/auto/quick/qquickdesignersupport/tst_qquickdesignersupport.cpp:684                                                                              
#7  0x3e782fc4 in QMetaMethod::invoke (this=this@entry=0x4004a688, object=object@entry=0x3fffea10, connectionType=connectionType@entry=Qt::DirectConnection, returnValue=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=...,        
    val9=...) at /home/qt/work/qt/qtbase/src/corelib/kernel/qmetaobject.cpp:2340                                                                                                                                                                                               
#8  0x3f79e22a in QMetaMethod::invoke (val9=..., val8=..., val7=..., val6=..., val5=..., val4=..., val3=..., val2=..., val1=..., val0=..., connectionType=Qt::DirectConnection, object=0x3fffea10, this=<optimized out>)                                                       
    at /home/qt/work/qt/qtbase/src/corelib/kernel/qobjectdefs.h:129                                                                                                                                                                                                            
#9  QTest::TestMethods::invokeTestOnData (this=this@entry=0x3fffe858, index=index@entry=0) at /home/qt/work/qt/qtbase/src/testlib/qtestcase.cpp:934                                                                                                                            
#10 0x3f79e862 in QTest::TestMethods::invokeTest (this=this@entry=0x3fffe858, index=index@entry=0, data=<optimized out>, watchDog=0x4004ad68) at /home/qt/work/qt/qtbase/src/testlib/qtestcase.cpp:1163                                                                        
#11 0x3f79eef0 in QTest::TestMethods::invokeTests (this=this@entry=0x3fffe858, testObject=0x3fffea10) at /home/qt/work/qt/qtbase/src/corelib/tools/qscopedpointer.h:140
#12 0x3f79f25c in QTest::qRun () at /home/qt/work/qt/qtbase/src/testlib/qtestcase.cpp:1933
#13 0x3f79f4da in QTest::qExec (testObject=<optimized out>, argc=<optimized out>, argv=<optimized out>) at /home/qt/work/qt/qtbase/src/testlib/qtestcase.cpp:1841
#14 0x400071ea in main (argc=<optimized out>, argv=0x3fffeba4) at /home/qt/work/qt/qtdeclarative/tests/auto/quick/qquickdesignersupport/tst_qquickdesignersupport.cpp:766