Evaluate how kernel memory poisoning works for tmpfs

See draft test procedure on #12354-note_13 and #12354-note_16. Work shall be based on the wip/feature/12090-slab-poisoning branch.

Feature Branch: bugfix/12354-drop-kexec-memory-wipe

Original created by @intrigeri on 12397 (Redmine)

Edited Nov 22, 2019 by intrigeri

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