checking rd_rules in RelationBuildDesc

[Ted Yu]

Hi,
(In light of commit 7b2ccc5e03bf16d1e1bbabca25298108c839ec52)

In RelationBuildDesc(), we have:

        if (relation->rd_rel->relhasrules)
                RelationBuildRuleLock(relation);

I wonder if we should check relation->rd_rules after the call
to RelationBuildRuleLock().

Your comment is appreciated.

build-desc-check-rules.patch
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