remaining libjava/verify_local_live_at_start failures

[John Wehle]

> The problem is that global liveness is not recomputed after dead code removal
> keeping it in inconsistent state.

In the past this has been caused by cleanup_cfg making a change
and returning zero (indicating that nothing changed).
update_life_info has:

  for ( ; ; )
    {

      ...
      if (! changed || ! cleanup_cfg (CLEANUP_EXPENSIVE))
        break;
    }

So as long as cleanup_cfg returns non-zero update_life_info will
DTRT by iterating until global liveness / dead code removal converges.

-- John
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