PowerPC fastpaths for mutex subsystem

[Joel Schopp]

This is the second pass at optimizing the fastpath for the new mutex subsystem 
on PowerPC.  I think it is ready to be included in the series with the other 
mutex patches now.  Tested on a 4 core (2 SMT threads/core) Power5 machine with 
gcc 3.3.2.

Test results from synchro-test.ko:

All tests run for default 5 seconds
Threads semaphores  mutexes     mutexes+attached
1       63,465,364  58,404,630  62,109,571
4       58,424,282  35,541,297  37,820,794
8       40,731,668  35,541,297  40,281,768
16      38,372,769  37,256,298  41,751,764
32      38,406,895  36,933,675  38,731,571
64      37,232,017  36,222,480  40,766,379

Signed-off-by: Joel Schopp <jschopp at austin.ibm.com>
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