message: Test for missing large tail allocations in the "recording" MicroAllocator.
  This change ensures that any large tail allocation should be handled and recorded with the RecordingMicroAllocator. The "misc" category for the keyword model currently is at 1004 bytes on my machine. I'll start with exactly 1kb ceiling for now.
diff: @@ -30,6 +30,7 @@ namespace {
  // Ensure memory doesn't expand more that 3%:
  constexpr float kAllocationThreshold = 0.03;
  +constexpr float kAllocationTailMiscCeiling = 1024;
  const bool kIs64BitSystem = sizeof(void*) == 8;
  constexpr int kKeywordModelTensorArenaSize = 22 * 1024;
  @@ -127,6 +128,17 @@ void ValidateModelAllocationThresholds(
  allocator.GetRecordedAllocation(tflite::RecordedAllocationType::kOpData)
  .used_bytes,
  thresholds.op_runtime_data_size);
  +
  + // Ensure tail allocation recording is not missing any large chunks:
  + size_t tail_est_length = sizeof(TfLiteTensor) * thresholds.tensor_count +
  + thresholds.tensor_quantization_data_size +
  + thresholds.tensor_variable_buffer_data_size +
  + sizeof(tflite::NodeAndRegistration) *
  + thresholds.node_and_registration_count +
  + thresholds.op_runtime_data_size;
  +
  + TF_LITE_MICRO_EXPECT_LE(thresholds.tail_alloc_size - tail_est_length,
  + kAllocationTailMiscCeiling);
  }
  } // namespace
  