Add comment on how StructureMemoryManager grows the free list when there are no free blocks.
Created attachment 451833 [details] Patch
Created attachment 451834 [details] Patch
Committed r289718 (247203@main): <https://commits.webkit.org/247203@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 451834 [details].
<rdar://problem/88875730>