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Rearrange explain.c's API so callers need not embed sizeof(ExplainSta…
…te). The folly of the previous arrangement was just demonstrated: there's no convenient way to add fields to ExplainState without breaking ABI, even if callers have no need to touch those fields. Since we might well need to do that again someday in back branches, let's change things so that only explain.c has to have sizeof(ExplainState) compiled into it. This costs one extra palloc() per EXPLAIN operation, which is surely pretty negligible.
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