QReg*Exp*s can be compared for equality,
so qHash should be overloaded, too.
There was a (poor) private implementation of qHash(QRegExpEngineKey)
already, which has now been replaced with a better one (the old one
didn't take into account all the fields that make up equality,
producing unnecessary collisions).
[ChangeLog][QtCore][QRegExp] Added qHash(QRegExp).
[ChangeLog][QtCore][QRegularExpression] Added qHash(QRegularExpression).
Change-Id: I1d22fbcc0508018a3f94b4c24571b13ba6e07df2
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
87155a8d65