add relu lowering

add relu validation
add spatial compute helper
minor refactors

src/PIM/Conversion/ONNXToSpatial/Patterns/Math/Conv.cpp

@@ -260,6 +260,6 @@ LogicalResult ConvToGemm::matchAndRewrite(ONNXConvOp convOp,
   return success();
 }
 
-void populateConvOpPatterns(RewritePatternSet& patterns, MLIRContext* ctx) { patterns.insert<ConvToGemm>(ctx); }
+void populateConvPatterns(RewritePatternSet& patterns, MLIRContext* ctx) { patterns.insert<ConvToGemm>(ctx); }
 
 } // namespace onnx_mlir