message: Add a comment for thread safety analysis
diff: @@ -1192,7 +1192,7 @@ class SparseApplyAdadeltaOp : public OpKernel {
  OP_REQUIRES_OK(ctx, ctx->GetAttr("use_locking", &use_exclusive_lock_));
  }
  - void Compute(OpKernelContext* ctx) override TF_NO_THREAD_SAFETY_ANALYSIS {
  + void Compute(OpKernelContext* ctx) {
  const bool sparse = true;
  auto locks = MaybeLockVariableInputMutexesInOrder<Device, T>(
  ctx, use_exclusive_lock_, sparse, {0, 1, 2});
  