replace helper-op cleanup with canonicalization

clean up PIM pattern naming
remove unused ValueMap.hpp

src/PIM/Conversion/ONNXToSpatial/CMakeLists.txt

@@ -8,9 +8,8 @@ add_pim_library(OMONNXToSpatial
   Patterns/Math/MatMul.cpp
   Patterns/NN/Pooling.cpp
   Patterns/NN/ReduceMean.cpp
-  Patterns/Tensor/ONNXConcatToTensorConcat.cpp
-  Patterns/Tensor/ONNXReshapeToTensorReshape.cpp
-  Patterns/Tensor/RemoveUnusedHelperOps.cpp
+  Patterns/Tensor/Concat.cpp
+  Patterns/Tensor/Reshape.cpp
   Utils/SpatialReducer.cpp
   Utils/WeightSubdivider.cpp
   Utils/AnnotateReplication.cpp