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Simon Marlow authored
Add a BF_PINNED block flag, and attach it to blocks containing pinned objects (in addition to the usual BF_LARGE). In heapCensus, we now ignore blocks containing pinned objects, because they might contain gaps, and in any case it isn't clear that we want to include the whole block in a heap census, because much of it might well be dead. Ignoring it isn't right either, though, so this patch just fixes the crash and leaves a ToDo.
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