RFC: Implement hwpoison on free for soft offlining

[Andi Kleen]

Here's a somewhat experimental patch to improve soft offlining
in hwpoison, but allowing hwpoison on free for not directly
freeable page types. It should work for nearly all
left over page types that get eventually freed, so this makes
soft offlining nearly universal. The only non handleable page
types are now pages that never get freed.

Drawback: It needs an additional page flag. Cannot set hwpoison
directly because that would not be "soft" and cause errors.

Since the flags are scarce on 32bit I only enabled it on 64bit.

Comments?

-Andi

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