[AutoTVM][Autoscheduler] Default build funcs inherit PassContext

[AndrewZhaoLuo]

These funcs used building during the tuning process now inherit PassContext so we can inject things like pass instrumentation into the build process during tuning.

Note, due to the fact subprocesses are used for building by default, we can't naively do something like

with PassContext(...):
   tune()

since new processes will not inherit the parents context.

But what does allow us to do is wrap the existing build functions with new PassContexts and call those instead making it a little more extensible.

[areusch]

should we do something like assert if the PassContext changes between Tuner construction and calling tune()? would help reduce the confusion, i think.

[AndrewZhaoLuo]

Hmm, I don't think that would be super helpful since the issue comes from the fact that during tuning, the PassContext is ignored by the children processes which actually build stuff during tuning. So even if it does change, it doesn't really matter imo

I guess we can make it so PassContext is inherited instead, which I guess I'll take a look, it will make things even more transparent.

[AndrewZhaoLuo]

Just noticed I accidently opened this on main repo instead of my own fork, moved to #11632