Speedup Traits recompilation

[jecisc]

Trait recompilation can become really slow if the trait is used a lot.

For example, on my machine, it takes 58seconds to add an ivar to TEntityMetalevelDependency from Moose.

Here is a step forward into speeding up this. I introduced a method #selectorsDo: on trait compositions and I used it to implement a faster #includesSelector:.

The idea of #selectorsDo: is to not create intermediate collections and to stop faster if we have a non local return.

With this change, the recompilation of TEntityMetalevelDependency dropped to around 45sec. The change is not huge, but it is better than nothing.

[jecisc]

I have another idea to speed up the compilation.

In #rebuildMethodDictionary we ask to the trait composition the selectors to rebuild. But then, we spend time looking for the defining trait of each selector to set the trait origin property, to find the compiled method and to find the source code.

What we could do is to implement a method returning the selectors of the trait composition linked to their defining trait. Like this, we would avoid 3 lookup of the origin trait.

Here we can see all the senders of #memberForSelector:

But I have no idea when I'll have the time to implement this. It'll probably be for another PR. And maybe a first step could be to check only once for the defining trait in #compile:into:?