message: [XLA] Deprecate BufferValue::color.
diff: @@ -108,18 +108,21 @@ class BufferValue {
  // Return the color of the BufferValue. Differently colored buffers can not be
  // parts of the same allocation.
  + ABSL_DEPRECATED("Use Layout::memory_space instead.")
  Color color() const {
  CHECK_NE(color_, kInvalidColor)
  << "Should not query the color of a buffer that was never colored";
  return color_;
  }
  + ABSL_DEPRECATED("Use Layout::memory_space instead.")
  void set_color(Color color) {
  CHECK_NE(color, kInvalidColor)
  << "Should not set the color of a buffer to the invalid color";
  color_ = color;
  }
  + ABSL_DEPRECATED("Use Layout::memory_space instead.")
  bool has_color() const { return color_ != kInvalidColor; }
  // Return the shape of the buffer. This reference points into the shape field
  