[mlir][NFC] Use Builder for getReassociationIndicesAttribute method. (llvm#137251)

The method does not need to create any operation, so we can use Builder.
It can be reused by any attribute getter implementation, so it does not
need to declare OpBuilder in the implementation.

Signed-off-by: hanhanW <[email protected]>

Author: hanhanW

mlir/include/mlir/Dialect/Utils/ReshapeOpsUtils.h

@@ -57,7 +57,7 @@ getSymbolLessAffineMaps(ArrayRef<ReassociationExprs> reassociation);
 
 /// Wraps a list of reassociations in an ArrayAttr.
 ArrayAttr
-getReassociationIndicesAttribute(OpBuilder &b,
+getReassociationIndicesAttribute(Builder &b,
                                  ArrayRef<ReassociationIndices> reassociation);
 
 /// Convert Array<Array<AffineExpr>> to Array<Array<int64_t>>.

mlir/lib/Dialect/Utils/ReshapeOpsUtils.cpp

@@ -158,7 +158,7 @@ unsigned getMaxPosOfType(ArrayRef<ReassociationExprs> exprArrays) {
 }
 
 ArrayAttr mlir::getReassociationIndicesAttribute(
-    OpBuilder &b, ArrayRef<ReassociationIndices> reassociation) {
+    Builder &b, ArrayRef<ReassociationIndices> reassociation) {
   SmallVector<Attribute, 4> reassociationAttr =
       llvm::to_vector<4>(llvm::map_range(
           reassociation, [&](const ReassociationIndices &indices) -> Attribute {