fixed some python imports

Change required to enable
./tools/torchscript_e2e_test.sh --config=iree

python/npcomp/compiler/numpy/backend/iree.py

@@ -5,8 +5,8 @@
 import io
 import subprocess
 
-from mlir.ir import *
-from mlir.passmanager import *
+from npcomp.ir import *
+from npcomp.passmanager import *
 from npcomp.compiler.generic.backend import iree as iree_backend
 from npcomp.compiler.utils import logging
 

python/npcomp/compiler/numpy/backend/refjit.py

@@ -4,8 +4,8 @@
 
 import os
 
-from mlir.ir import *
-from mlir.passmanager import *
+from npcomp.ir import *
+from npcomp.passmanager import *
 from npcomp.compiler.generic.backend import refjit as refjit_backend
 from npcomp.compiler.utils import logging
 

python/npcomp/compiler/pytorch/backend/frontend_lowering.py

@@ -6,8 +6,8 @@ import os
 
 import torch
 
-from mlir.ir import *
-from mlir.passmanager import *
+from npcomp.ir import *
+from npcomp.passmanager import *
 from npcomp.compiler.utils import logging
 
 __all__ = [

python/npcomp/compiler/pytorch/backend/iree.py

@@ -7,8 +7,8 @@ import os
 import torch
 import numpy as np
 
-from mlir.ir import *
-from mlir.passmanager import *
+from npcomp.ir import *
+from npcomp.passmanager import *
 from npcomp.compiler.utils import logging
 import iree.runtime as ireert
 import iree.compiler as ireec