Qt Creator 4.3 hangs on startup when using 5.9

Introduced by "Initialize QLoggingRegistry rules on first use, not qApp construction" 47cc9e23a313d67a4a3107242f205d2473842021
(qtbase/5.9) https://codereview.qt-project.org/#/c/191711/

Note: Creator does

 QLoggingCategory::setFilterRules(QLatin1String("qtc.*.debug=false\nqtc.*.info=false"));

before QtSingleApplication instantiation at src/app/main.cpp:288 .