A handful of methods were loading the same member twice in the same
method.

Bug: v8:7790
Change-Id: I20a1a95ed9dae2ff75bfdbf4c571d26ad02b1f94
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2454717Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70440}