WiredTiger session statistics cursor returns incorrect key on BigEndian systems

MongoDB server fetches the key from the session statistics cursor here. On big endian system this key is not in the expected form.

e.g. On a little endian system a key 4000(0xFA0) is returned like this:

The key returned by WiredTiger stats cursor: 93823560585120 (0x555500000FA0)

Whereas the same key on big endian system is like this:

The key returned by WiredTiger stats cursor: 17180800459888 (0xFA037822470) 

Investigate that why session statistics cursor returns the incorrect correct key.