Try to fix problems with periodic hangs by never directly calling _BIF. Instead, re-evaluate _BIF only when we get a notify and use the cached results.  We also still evaluate _BIF once on boot.  Also, optimize the init loop a little by only querying for a particular info if it's not valid.
Try to fix problems with periodic hangs by never directly calling _BIF.
Instead, re-evaluate _BIF only when we get a notify and use the cached
results.  We also still evaluate _BIF once on boot.  Also, optimize the
init loop a little by only querying for a particular info if it's not valid.

MFC after:	2 days

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