minor code-quality regression vs. 2.95

[John Wehle]

> It's really a pain that we can't depend on lifetime information throughout the
> compiler.  Is there an estimate on how much work it would take to make
> the scheduler maintain REG_DEAD notes?

A while back I put together a patch for the old scheduler to
address this (then Jeff went and deleted the scheduler on me :-).
I have it on my short list to do for the current scheduler, however
you're welcome to beat me to the punch.  The changes for the old
scheduler to preserve the REG_DEAD notes were pretty minor.

-- John
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