As discussed offline: I think this can be realized by not remembering the
instance type in HAllocate instructions (hence it also cannot become
invalid for
folded allocations). Instead we could track a
"depends_on_following_garbage_being_zapped" field (name might need some
work).
That is initially set depending on whether the instance type is tracked or
not.
On folding, the field gets reset depending on whatever the dominated
instruction
requests.
https://codereview.chromium.org/22915007/
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