CPlusPlus: Inline some Literals members

Basically all that generate at most 7 bytes. With the call being 5
and some hope of intra-caller optimization gains that shouldn't explode.

Change-Id: I4145d69d38a7956362263e9d432eb47bb58d3261
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>