[patch] Vector assignment, sarsim bits

[Jules Bergmann]

A bunch of misc things collected over the past few weeks to optimize and 
parallel sarsim.

Perhaps the most substantial bit, I changed the Vector assignment 
operators (+=, -=, etc) to go through the same dispatch as 'operator=', 
so that 'A += B' gets evaluated as 'A = A + B'.  This throws away the 
knowledge that it is an update expression, but it lets it get evaluated 
by IPP when possible.  In the long term, we may want to add special 
dispatch for operator assignment so we don't throw this knowledge away.

Thoughts?

				-- Jules
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