This CL moves FunctionTemplateInfo to the list of never serialized
objects, allowing direct heap reads. To make this threadsafe, the CL:
- adds necessary atomic (relaxed/acquire-release) operations to the
  accessors of FunctionTemplateInfo.
- changes FunctionTemplateInfoRef::LookupHolderOfExpectedType to be
  usable from the background thread (e.g. no handle construction) with
  the caveat of skipping optimization in some cases where necessary
  JSObjects are not serialized.

Drive-by: Add missing serialization of objects possibly reachable
through CallHandlerInfo::data.

Bug: v8:7790
Change-Id: I49cf4f328ecfab368dff9076fde8f5783ead3246
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2679687Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73364}