[Core][Build] Move build module transformations and utilities to C++

[mikepapadim]

This PR builds on top of @electriclilies initial work to move and unify build into C++ driver_api.cc from build_module.py.
It removes redundant optimizations passes and introduces helpers functions for target mangling in the driver_api.

@mbs-octoml @jroesch @electriclilies @areusch

[tqchen]

Thanks @mikepapadim . One thing that would be very helpful is to split the logic into two parts:

• A function that configures and returns the composite Pass(aka the sequential)
• A function that uses the above function to construct the composite pass and execute the optimization.

As part of python first principle, we want to enable ways to access and tweak optimizations in python easily. While majority of the default logic can sit in c++. It would be super helpful to have a python function that returns the composite pipeline, and possibly allow us to do further customizations (in python) if necessary and invoke them.

[mikepapadim]

Thanks @mikepapadim . One thing that would be very helpful is to split the logic into two parts:

* A function that configures and returns the composite Pass(aka the sequential)

* A function that uses the above function to construct the composite pass and execute the optimization.

As part of python first principle, we want to enable ways to access and tweak optimizations in python easily. While majority of the default logic can sit in c++. It would be super helpful to have a python function that returns the composite pipeline, and possibly allow us to do further customizations (in python) if necessary and invoke them.

Thanks @tqchen. So, we want to expose on the python side the ability to register additional passes for mixed_mod, device_mod and host_mod per pass manager when we are doing the split?

[mikepapadim]

PTAL
If it is in a good state we can have a follow-up PR with just for adding the flexibility on adding passes on the separate module managers from the python side.

[mikepapadim]

@mbs-octoml @jroesch @tqchen this can be merged now

[jroesch]

I think we should probably come up with a better name for this function, finalize has too many technical meanings, probably better to call something which implies what is going on cc @mbs-octoml going to land as is, maybe we can make a note to follow up on this.

[mikepapadim]

Sure, IMO there is some more cleanup to be done in build_module.