Deadbeef check missing from kmem.c

[GoogleCodeExporter]

There are two sets of data that are in the OpenSolaris but not MacZFS build in 
kmem.c at maczfs-
72. 

One of these is an audit trail (which may not be useful), and the other is a 
DEADBEEF trail (which 
shows if the memory has been hit or overrun). A simple compile test case 
suggests that the 
DEADBEEF codepath works, and that the #ifdefs surrounding this and other 
codepaths may be 
taken out.

Original issue reported on code.google.com by alex.ble...@gmail.com on 7 Mar 2010 at 11:32