QtAutogen: Don't take a reference to temporary.

While a const reference to a temporary is standard conformant,
it doesn't seem to be necessary or advantageous here.
QtAutogen: Use cmHasLiteral{Prefix,Suffix} where possible.
Merge topic 'clean-autogen' into next

3bd59b60 QtAutogen: Use cmHasLiteral{Prefix,Suffix} where possible.
bf00f528 QtAutogen: Don't take a reference to temporary.