message: refactor: Rework asmap Interpret to avoid ptrdiff_t
diff: @@ -93,7 +93,8 @@ uint32_t Interpret(const std::vector<bool> &asmap, const std::vector<bool> &ip)
  jump = DecodeJump(pos, endpos);
  if (jump == INVALID) break; // Jump offset straddles EOF
  if (bits == 0) break; // No input bits left
  - if (jump >= endpos - pos) break; // Jumping past EOF
  + if (pos + jump < pos) break; // overflow
  + if (pos + jump >= endpos) break; // Jumping past EOF
  if (ip[ip.size() - bits]) {
  pos += jump;
  }
  @@ -155,7 +156,8 @@ bool SanityCheckASMap(const std::vector<bool>& asmap, int bits)
  } else if (opcode == Instruction::JUMP) {
  uint32_t jump = DecodeJump(pos, endpos);
  if (jump == INVALID) return false; // Jump offset straddles EOF
  - if (jump > endpos - pos) return false; // Jump out of range
  + if (pos + jump < pos) return false; // overflow
  + if (pos + jump > endpos) return false; // Jump out of range
  if (bits == 0) return false; // Consuming bits past the end of the input
  --bits;
  uint32_t jump_offset = pos - begin + jump;
  