* prim threefry
* test fix
* clean test
* cleanup
* cleanup 2
* cleanup 3
* fix conflict markers in test_const_folding.py
* update test
* fix lint
* use const instead of value for test
* fixes and test relaxations from prealloc_bufs
* fix error type and guard _mop
* revert that
* contiguous makes extra/torch_backend/test_kernel_fusion.py fail