BasicMemoryChunk sits above the MemoryChunk in the chunk hierarchy and
is responsible for storing the bare minimum data to identify a chunk of
memory, without worrying about GC etc.

This change also completes the MemoryChunk offset asserts, which were
previously missing for few key properties.

Bug: v8:7464
Change-Id: Id4c7716c4ed5722ceca3cbc66d668aed016c74b0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1688843
Commit-Queue: Maciej Goszczycki <goszczycki@google.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62652}