* start work on schedule cache
* local unique
* schedule cache works
* schedule cache cleanup
* fix tests
* preserve metadata
* oops, fix cache
* put that there
* fix spec
* always miss
* why is that broken?
* src[0].op
* fix process replay
* delete abstractions2
* reenable the actual schedule cache
* metadata is best effort
* fix JIT in examples/gradaccum_mnist.py
* full jit
* fixed and test is real
