Changeset 9757:071a2d97327a
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sim: unify memory & ethernet port binding mechanisms.

Get rid of the ugly special-casing and dynamic casting going
on in connectPorts(), and make the port binding mechanism
more extensible.  This is done by moving the port lookup
methods to SimObject and  creating a common base Port class
from which both the old Port (now MemPort) and EtherInt
(which perhaps should be renamed EtherPort) derive.