[mlir][sparse] remove unused COO method (#73595)

step closer towards moving all type related methods into encoding and/or
sparse tensor type class

Author: aartbik

mlir/include/mlir/Dialect/SparseTensor/IR/SparseTensor.h

@@ -102,12 +102,10 @@ bool isUniqueCOOType(Type tp);
 /// the level-rank.
 Level getCOOStart(SparseTensorEncodingAttr enc);
 
-/// Helpers to setup a COO type.
+/// Helper to setup a COO type.
 RankedTensorType getCOOFromTypeWithOrdering(RankedTensorType src,
                                             AffineMap ordering, bool ordered);
 
-RankedTensorType getCOOFromType(RankedTensorType src, bool ordered);
-
 /// Returns true iff MLIR operand has any sparse operand.
 inline bool hasAnySparseOperand(Operation *op) {
   return llvm::any_of(op->getOperands().getTypes(), [](Type t) {

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

@@ -878,7 +878,7 @@ Level mlir::sparse_tensor::getCOOStart(SparseTensorEncodingAttr enc) {
   return lvlRank;
 }
 
-// Helpers to setup a COO type.
+// Helper to setup a COO type.
 RankedTensorType sparse_tensor::getCOOFromTypeWithOrdering(RankedTensorType rtt,
                                                            AffineMap lvlPerm,
                                                            bool ordered) {
@@ -911,13 +911,6 @@ RankedTensorType sparse_tensor::getCOOFromTypeWithOrdering(RankedTensorType rtt,
   return RankedTensorType::get(src.getDimShape(), src.getElementType(), enc);
 }
 
-RankedTensorType sparse_tensor::getCOOFromType(RankedTensorType src,
-                                               bool ordered) {
-  return getCOOFromTypeWithOrdering(
-      src, AffineMap::getMultiDimIdentityMap(src.getRank(), src.getContext()),
-      ordered);
-}
-
 Dimension mlir::sparse_tensor::toDim(SparseTensorEncodingAttr enc, Level l) {
   if (enc) {
     assert(enc.isPermutation() && "Non permutation map not supported");