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Avoid charging TV_EXPAND for loop initialization and finalization


This is one of the straggler patches for 15524.

We are currently charging TV_EXPAND for things like look initialization
and finalization -- which is clearly not a good idea.  And for code like
15524 it hides how expensive loop optimization initialization really is.

Bootstrapped and regression tested on i686-pc-linux-gnu (several
times over the last week or so :-)




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