Found in API review, but not deemed important enough to still get into
6.7.
Not implementing it for QMultiMap, because there we need to mod out
order of equivalent elements.
The GHS compiler acted up and tried to compile the noexcept
specification, hitting non-existing qHash(QVariant) for QVariantMap
and producing a hard error instead of SFINAE'ing out. As a
work-around, establish an artificial SFINAE-friendly context, but only
for that compiler.
[ChangeLog][QtCore][QMap/QHash] Added qHash() overload for QMap.
Change-Id: Ia7dbf488e8e5490962118e40581b7c4cc8ed95e5
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
e1f45ad818