Both QByteArrayView and std::string_view are Literal Types, so the
conversion between them should be constexpr.
Amends 96d67da420.
Found in API-review.
Pick-to: 6.7
Change-Id: Ic513ce32aa2a743ca890dc05a683a62c0f3a7d50
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>