FIX biographical profiling (#3039, probably #2297)
Since we introduced pointer tagging, we no longer always enter a closure to evaluate it. However, the biographical profiler relies on closures being entered in order to mark them as "used", so we were getting spurious amounts of data attributed to VOID. It turns out there are various places that need to be fixed, and I think at least one of them was also wrong before pointer tagging (CgCon.cgReturnDataCon).
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