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This PR makes the following change to AOT kernel
- Allow the client to generate AOT kernels with different sets of
constexprs and meta-parameters. Each combination of constexpr set and
meta-parameters is referred to an "algo". Within an algo client can
still give different hints about integer arguments.
- Add a API int ${kernle_name}_get_num_algos() that returns the total
number of algos.
- Add a algo_id to allow client to the generated kernel to select the
algo
- Remove gX, gY and gZ from the kernel parameter list. This is because
the launch grid is usually different with different algos, and the
client should not need to care about how to compute the launch grid for
each algo. Instead, we ask the client to pass the expression of
computing gX, gY and gZ for compile.py (when AOT kernels are generated).
The expression can only use kernel parameter or const values.
- We also change the testing flow. Now we first build the kernels into a
shared library libkernel.so, then the client test.c code is built and
link with libkernel.so. This is closer to a typical AOT kernel usage
flow.