refactor Pim constant folding pass

share contiguous address resolution in PimCommon
group patterns in subdir for each pass with pattern files

src/PIM/Common/PimCommon.hpp

@@ -17,6 +17,11 @@ inline constexpr llvm::StringRef PimWeightAlwaysAttrName = "weightAlways";
 
 namespace onnx_mlir {
 
+struct ResolvedContiguousAddress {
+  mlir::Value base;
+  int64_t byteOffset = 0;
+};
+
 std::string getOutputDir();
 
 void createDirectory(const std::string& directory);
@@ -48,4 +53,6 @@ bool isMemoryContiguous(llvm::ArrayRef<int64_t> srcShape,
                         llvm::ArrayRef<int64_t> sizes,
                         llvm::ArrayRef<int64_t> strides);
 
+llvm::FailureOr<ResolvedContiguousAddress> resolveContiguousAddress(mlir::Value value);
+
 } // namespace onnx_mlir