Keep AppendingBlockImpl edge fields monomorphic - #21610
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Split out of nvp/simplify-some-vm-hot-paths. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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A block's first and last edge is either a DOM node or a nested block, so they now live in separate
first/firstBlockandlast/lastBlockfields instead of wrapping nodes inFirst/Lastobjects. This removes two allocations per appended node and keeps the reads inclear()monomorphic.