Patch: RTL loop opt bug

[Dale Johannesen]

This fixes a loop optimization bug I encountered running equake (SPEC)
on the LNO branch.  While I don't know of any way to get a FE to 
generate
the failing RTL pattern (see patch) in mainline, I believe it is pretty 
obviously
wrong there also, and that's where I'd like to fix it.    Bootstrapped 
and
tested on darwin.



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