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e4c14190bb
An operation is considered to properly dominate itself in a graph region. That's because there is no concept of "dominance" in a graph region. (`dominates` returns "true" for all pairs of ops in the same block. It makes sense to do the same for `properlyDominates`.) Previously, a block was *not* considered to dominate itself in a graph region. This commit fixes this asymmetry between ops and blocks: both are now properly dominating themselves in a graph region.