Your Jan 8th, 2001 rtlanal.c:note_stores change

[Richard Kenner]

    Well, this plus the fact that you can't remember any of the details of
    the failure puts us at a deadlock, doesn't it?

It sounds like we need a construct that says "I'm setting this register to
something, but I don't know what it is".  For almost all purposes except
in those functions you mention, this is *precisely* what CLOBBER means, which
is why I used it.  This works fine because register life is computed by an
entirely different mechanism.

What would you suggest as the mechanism to say the above?