[REG 5.15] Crash during construction of QLocale() on Windows

#include <QLocale>

int main(int argc, char *argv[])
{
    QLocale::system();
}

ASSERT: "uint(i) < uint(size())" in file C:\dev\qt\5.15\msvc-2019-amd64\qtbase\include\QtCore\../../../../src/qtbase/src/corelib/text/qstring.h, line 1031

1  qt_message_fatal       qlogging.cpp   1865 0x7ff9da51c40d 
2  QMessageLogger::fatal  qlogging.cpp   893  0x7ff9da51abe3 
3  qt_assert              qglobal.cpp    3354 0x7ff9da50b089 
4  QString::at            qstring.h      1031 0x7ff9da4cb49e 
5  updateSystemPrivate    qlocale.cpp    754  0x7ff9da6b3362 
6  systemData             qlocale.cpp    772  0x7ff9da6b3413 
7  QLocale::system        qlocale.cpp    2723 0x7ff9da6aa176 
8  main                   main.cpp       5    0x7ff6dbc41398 
9  invoke_main            exe_common.inl 79   0x7ff6dbc41989 
10 __scrt_common_main_seh exe_common.inl 288  0x7ff6dbc4182e 
11 __scrt_common_main     exe_common.inl 331  0x7ff6dbc416ee 
12 mainCRTStartup         exe_main.cpp   17   0x7ff6dbc41a19 
13 BaseThreadInitThunk    KERNEL32            0x7ffa53a17bd4 
14 RtlUserThreadStart     ntdll               0x7ffa53e2ced1