Moves the lowering of bufferization.dealloc to memref into a separate pass,
but still registers the pattern in the conversion pass. This is helpful when
some tensor values (and thus to_memref or to_tensor operations) still
remain, e.g., when the function boundaries are not converted, or when constant
tensors are converted to memref.get_global at a later point.
However, it is still recommended to perform all bufferization before
deallocation to avoid memory leaks as all memref allocations inserted after the
deallocation pass was applied, have to be handled manually.
Note: The buffer deallocation pass assumes that memref values defined by
bufferization.to_memref don't return ownership and don't have to be
deallocated. bufferization.to_tensor operations are handled similarly to
bufferization.clone operations with the exception that the result value is
not handled because it's a tensor (not a memref).