Add SSA compiler pipeline and unified backends

src/ninetoothed/__init__.py

@@ -1,4 +1,5 @@
 from ninetoothed.build import build
+from ninetoothed.compiler.jit import jit
 from ninetoothed.dtype import (
     bfloat16,
     float16,
@@ -15,7 +16,6 @@
 )
 from ninetoothed.eval import _eval as eval
 from ninetoothed.eval import _subs as subs
-from ninetoothed.jit import jit
 from ninetoothed.make import make
 from ninetoothed.symbol import Symbol, block_size
 from ninetoothed.tensor import Tensor