Merge branch 'Dynptr refactorings'

Kumar Kartikeya Dwivedi says:

====================

This is part 1 of https://lore.kernel.org/bpf/20221018135920.726360-1-memxor@gmail.com.
This thread also gives some background on why the refactor is being done:
https://lore.kernel.org/bpf/CAEf4Bzb4beTHgVo+G+jehSj8oCeAjRbRcm6MRe=Gr+cajRBwEw@mail.gmail.com

As requested in patch 6 by Alexei, it only includes patches which
refactors the code, on top of which further fixes will be made in part
2. The refactor itself fixes another issue as a side effect. No
functional change is intended (except a few modified log messages).

Changelog:
----------
v1 -> v2
v1: https://lore.kernel.org/bpf/20221115000130.1967465-1-memxor@gmail.com

 * Address feedback from Joanne and David, add acks

Fixes v1 -> v1
Fixes v1: https://lore.kernel.org/bpf/20221018135920.726360-1-memxor@gmail.com

 * Collect acks from Joanne and David
 * Fix misc nits pointed out by Joanne, David
 * Split move of reg->off alignment check for dynptr into separate
   change (Alexei)
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>