message: Change type to unsigned to avoid warning
diff: @@ -245,7 +245,7 @@ bool CanOptimizeIdentitySliceOp(Value input, Attribute begin, Attribute size) {
  // Checks if `begin` is all 0s, and `size[i]` is equal to either -1 or
  // `input.shape[i]`.
  - for (int64_t i = 0; i < rank; ++i) {
  + for (uint64_t i = 0; i < rank; ++i) {
  if (begin_attr.getValue<APInt>({i}).getSExtValue() != 0) return false;
  int64_t si = size_attr.getValue<APInt>({i}).getSExtValue();
  if (si != -1 && si != input_ty.getDimSize(i)) return false;
  