--max_log_size not work when larger than 4096

[ghostwang]

in logging.cc:
maximum of file_length_ is 0xFFFFFFFF
when --max_log_size is larger than 4096 (0xFFFFFFFF >> 20)
line 1108
if (static_cast<int>(file_length_ >> 20) >= MaxLogSize() || PidHasChanged()) {
the first condition will never satisfied.

[ColdZoo]

Thanks for this, you save my day!
We encountered a same problem when our SRE set max_log_size to 4GB!