One remaining Node* remains in EmitElementStore which will need to wait for
templated versions of StoreElement.

BUG=v8:10021

Change-Id: I6422b8dbfd1989cfc7587c2b180e542fbdb56382
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2007271Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65851}