The npcomp project has a really nice feature where they get a hash of the actual github workflow content, and use that in the cache key for the LLVM/MLIR build. This lets you tweak build settings in that file without munging up the cache key every time, so we should probably do something similar.

https://github.com/llvm/mlir-npcomp/blob/28a0f02746f4a1315d8e17d9560f7ae1c255236c/.github/workflows

Since #384 we can make use of the IR verification features of MLIR.

Our BConv op has a few parameter combinations where it can throw during Init or Prepare. In the converter we try to make sure that none of those cases will ev