When preparing for such a call, the byte code loads an "empty" constant.
This has to be represented in the type system so that we don't hit the
assert at the end of the instruction.
Pick-to: 6.4 6.2
Task-number: QTBUG-108441
Change-Id: I66220bfae3d3a4b8e9600d84d4cfc43ac858b77e
Reviewed-by: Sami Shalayel <sami.shalayel@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Ulf Hermann