ownMethodIndex works for all kind of methods, also for constructors.
Therefore, remove the assertion there (that checks for non constructors)
and add a test in qtbase so it does not happen again.
The test broken by the assertion is in qtdeclarative:
tst_QJSEngine::newQMetaObject().
Also rename QMetaMethodPrivate::ownConstructorIndex() to
ownConstructorMethodIndex() as the previous naming implied that
ownMethodIndex() could not be used for constructors.
amends b73ab954df
Task-number: QTBUG-105360
Change-Id: I0244993ed79bee055645b5443f5d02e1c089a6c6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>