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Another memory reduction for DOM


Like previous ones, except this one eliminates the block local
vrp_variables and nonzero_vars.  Which eliminates the need for
the block local data container as well.

In all, this only saves ~300k in Gerald's testcase.  It's mostly
done to keep the handling of these objects consistent with the
handling of the other block local information in DOM.

Bootstrapped and regression tested on i686-pc-linux-gnu.



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