If we can determine that the base of an optional lookup cannot hold null
or undefined, we can simply omit the optional part and generate a
regular get lookup. This is also true whenever we lookup an enum.
Amends fc4ee77116
Fixes: QTBUG-135649
Pick-to: 6.9 6.8
Change-Id: I64984fdecc75cd4dbc2274a08aa73b5274fb09b7
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Olivier De Cannière