Obsolete AddressMode enum with ERR

[bording]

What is the AddressMode enum for?

I don't see any references to it, and the comments make it sound like it must be some leftover from an earlier era.

Seems like something we can probably just get rid off, except that it's public.

[timbussmann]

yeah seems like something we should mark from removal.

[andreasohlund]

Retitled and added to the v8 milestone