message: XLA: fix naming of gather attributes
  These should match the ones in the XLA docs (https://www.tensorflow.org/xla/operation_semantics#gather). Most importantly collapsed dims instead of collapsed sizes.
diff: @@ -843,9 +843,9 @@ def XLA_GatherOp: XLA_Op<"gather", [NoSideEffect]> {
  ins XLA_Tensor:$operand,
  XLA_IntTensor:$start_indices,
  I64Attr: $index_vector_dim,
  - ElementsAttr: $offsets_dim,
  + ElementsAttr: $offset_dims,
  ElementsAttr: $slice_sizes,
  - ElementsAttr: $collapsed_slice_sizes,
  + ElementsAttr: $collapsed_slice_dims,
  ElementsAttr: $start_index_map
  );
  