Commits on Mar 26, 2021

1. Clean up host pointers in level 2 of clean-up flag …

   The host tree is a cyclical structure. Leaking a single DOM node can
   retain a large amount of memory. React-managed DOM nodes also point
   back to a fiber tree.
   
   Perf testing suggests that disconnecting these fields has a big memory
   impact. That suggests leaks in non-React code but since it's hard to
   completely eliminate those, it may still be worth the extra work to
   clear these fields.
   
   I'm moving this to level 2 to confirm whether this alone is responsible
   for the memory savings, or if there are other fields that are retaining
   large amounts of memory.
   
   In our plan for removing the alternate model, DOM nodes would not be
   connected to fibers, except at the root of the whole tree, which is
   easy to disconnect on deletion. So in that world, we likely won't have
   to do any additional work.

   

   acdlite committed Mar 26, 2021
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