MSVC managed to trigger the this != &other assertion in
QString(const QString &other); so just skip creation of the
intermediate string in the function whose body tripped over this.
Change-Id: I687003cfc588531018c6069863ce2a76078c8e3f
Fixes: QTBUG-73802
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>