[gentoo-user] gcc upgrade from 3.x to 4.x, when should I run revdep-rebuild?

I'm upgrading my gcc from 3.x to 4.x. I've done the gcc switching, and now I'm
updating my system.

The recommended steps are:

   # emerge -eav system
   # emerge -eav world

While emerging my system I received a message suggesting I run revdep-rebuild:

   warning - be sure to run revdep-rebuild now

My question is, should I run revdep-rebuild right after emerging the system,
or should I wait until after I emerge world? My concern was that in between,
my system is in an unstable intermediate state, and it might be damaged by a
revdep-rebuild in between.
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