Merge commit 'ce929fe84f9c453263af379f3b255ff8eca01d48'

Import CK as of commit 2265c7846f4ce667f5216456afe2779b23c3e5f7.

MFV CK@r336629: Import CK as of commit 1c1f9901c2dea7a883342cd03d3906a1bc482583

This adds CK_SLIST_INSERT_PREVPTR and CK_SLIST_REMOVE_PREVPTR macros
as well as ck_pr_dec_is_zero family of functions.

MFV CK@r336629: Import CK as of commit 1c1f9901c2dea7a883342cd03d3906a1bc482583

This adds CK_SLIST_INSERT_PREVPTR and CK_SLIST_REMOVE_PREVPTR macros
as well as ck_pr_dec_is_zero family of functions.

MFC after: 3 weeks

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Import CK as of commit b19ed4c6a56ec93215ab567ba18ba61bf1cfbac8
It should fix ck_pr_[load|store]_ptr on mips and riscv, make sure no
*fence instructions are used on i386, as older cpus don't support

Import CK as of commit b19ed4c6a56ec93215ab567ba18ba61bf1cfbac8
It should fix ck_pr_[load|store]_ptr on mips and riscv, make sure no
*fence instructions are used on i386, as older cpus don't support it, and
make sure we don't rely on gcc builtins that can lead to calls to
libatomic when linked with -O0.

MFC after: 1 week

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Import Concurrency Kit in the kernel.
CK is a toolkit providing different lockfree algorithms/data structures.
More information can be found here : www.concurrencykit.org