Swap optimization pass

[John Wehle]

Alan Lehotsky writes:
> Well, I'm sure it finds a lot of things this misses, (and possibly
> avoids register pressure problems), but I'll bet that putting
> something like this into your MD file would get 90% there and is
> way faster.....

In my case it is precisely the register pressure issue that is of
interest.  How much this helps real code and how much additional
overhead is associated with running the optimization pass are of
course unknowns at this point.  Off hand I expect the overhead to
be minimal.

-- John
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