message: [MIRAI] Add annotations to VM crates
  Closes:
  Approved by: metajack
diff: @@ -445,6 +445,10 @@ pub fn words_in(size: AbstractMemorySize<GasCarrier>) -> AbstractMemorySize<GasC
  precondition!(size.get() <= MAX_ABSTRACT_MEMORY_SIZE.get() - (WORD_SIZE.get() + 1));
  // round-up div truncate
  size.map2(*WORD_SIZE, |size, word_size| {
  + // static invariant
  + assume!(word_size > 0);
  + // follows from the precondition
  + assume!(size <= u64::max_value() - word_size);
  (size + (word_size - 1)) / word_size
  })
  }
  