Eo: Remove useless optimisation that is more harm than good.

Eo: Remove useless optimisation that is more harm than good.

It seems that the idea behind that optimisation, is to save object data
fetching when calling functions implemented by the object's class inside
functions implemented by the object's class. This should be rare enough
not to worth the upkeep, memory reads and memory writes, especially
since for all cases apart of mixins (for which this optimisation won't
work for anyway), the upkeep is more costly than fetching the data
again.