ObjectDataKind::kSerializedHeapObject is no longer in use.

Remove the CreateDataFunctors since creation code is now simple
and uniform enough to inline.

Bug: v8:7790
Change-Id: I90009373b4f6b5e1b0ed90c7ccff323dc9821ed8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3073740
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76113}