Put unique allocs in managed heap when they might contain managed boxes. #5083
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r? @pcwalton
Local testing shows it's correctly putting things like ~(@10) in the managed heap. Not entirely sure how to turn such tests (which just log annihilation stats) into a regression test; we don't have much in the way of feedback from the annihilator. Open to suggestions. I will want to be keeping more detailed runtime stats on the gc as I proceed.