Created by: Superjomn

Make model_optimize_tool work on the host device.

• add an AST parser written in Python to generate fake kernels for the tool

The tool works as follows:

1. collect a list of all the source files in the cmake add_kernel function,
2. generate the fake kernels according to the source list,
3. compile the model_optimize_tool sperately.

TODO

Recover the following tests:

• model_optimize
• gen_code