[PATCH v3r0 1/6] lib/stackdepot: allow requesting early initialization dynamically

[Vlastimil Babka]

Here's an updated version based on feedback so I don't re-send everything
so soon after v2. Also in git:
https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=slub-stackdepot-v3r0
There are only trivial adaptations in patch 3/6 to the stack depot init
changes otherwise.
Thanks, Vlastimil

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