…structure

    - Copied scheduler from MatmulLoopPipeline (much could be consolidated)
    - Enable register buffering (even though may increases register pressure)
    - Enable num_stages=2+, including multi-buffering, and make `2` the default
    - updated tutorial for new tuning default
    - added lit	tests

- Also move independent(from loop-carried buffer) `triton_gpu.local_store` as early as possible

- check for last atomic (sync?)
- also check for other accesses to the source