message: [XLA] Layout::Clear should clear the tiles field.
diff: @@ -223,10 +223,8 @@ class Layout {
  }
  void Clear() {
  + *this = Layout();
  format_ = INVALID_FORMAT;
  - minor_to_major_.clear();
  - max_sparse_elements_ = 0;
  - element_size_in_bits_ = 0;
  }
  template <typename H>
  