We don't need to serialize the descriptor array when concurrent
inlining so we can skip the methods related to serializing.

While doing so we bumped into two broken tests in serializer-tester.
Since we are planning on removing the serializer soon, it makes more
sense to remove them than trying to fix them.

Bug: v8:7790
Change-Id: Ib1feea16f09edebbd9927afc4178ed10f85fd42f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2975300
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75307}