Detailed description of changes:
r3588 | inaam | 2008-12-18 14:26:54 +0200 (Thu, 18 Dec 2008) | 8 lines
branches/5.1

It is a bug in unused code. If we don't calculate the hash value when
calculating the mutex number then two pages which map to same hash
value can get two different mutex numbers.

Approved by: Marko