[mlir][sparse] Removing unused helper function

Depends On D151505

Reviewed By: aartbik, Peiming

Differential Revision: https://reviews.llvm.org/D151522

mlir/lib/Dialect/SparseTensor/IR/SparseTensorDialect.cpp

@@ -31,17 +31,6 @@
 using namespace mlir;
 using namespace mlir::sparse_tensor;
 
-//===----------------------------------------------------------------------===//
-// Additional convenience methods.
-//===----------------------------------------------------------------------===//
-
-/// Gets the dimension-rank of the type of some `T`.  (In particular
-/// this is only used for `Value` and `TypedValue<RankedTensorType>`.)
-template <typename T>
-static inline Dimension getDimRank(T t) {
-  return getRankedTensorType(t).getRank();
-}
-
 //===----------------------------------------------------------------------===//
 // StorageLayout
 //===----------------------------------------------------------------------===//