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Names like |ptr| or |address| don't convey the intention for the pointer
to point to the beginning of a slot, and |slot_start| does it.

Improve comments while at it.

The renaming made it obvious that in one case SlotSpan::FromPointer
could be used instead of FromPointerNoAlignmentCheck.

Change-Id: I17cc44bcbbfad57e17477bf64d54d140ad279c3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631719Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844636}