SonarCloud reports a problem in new code added by JDK-8317683.

parseEnumValueAsUintx can return "true" without initializing the "value", at which point we pass uninitialized value to register_command.

Here:

```
  } else if (type == OptionType::Uintx) {
    uintx value;
    // Is it a named enum?
    bool success = parseEnumValueAsUintx(option, line, value, bytes_read, errorbuf, buf_size);
    if (!success) {
      // Is it a raw number?
      success = (sscanf(line, "" UINTX_FORMAT "%n", &value, &bytes_read) == 1);
    }
    if (success) {
      total_bytes_read += bytes_read;
      line += bytes_read;
      register_command(matcher, option, value); <--- value can be not initialized
      return;
    } else {
      jio_snprintf(errorbuf, buf_size, "Value cannot be read for option '%s' of type '%s'", ccname, type_str);
    }
```