git: Ignore additional files.

build: Bump version for next release.

ck_ring: Add a work-around for compiler bug(s) in ck_ring_dequeue_spmc.

Both LLVM-backed compilers and GCC incorrectly treat
a barrier-sandwiched load as a loop invariant in dequeue_spmc.
Forcing volatile atomic load semantics generates the right
thing.

Thanks to Devon O'Dell and Abel Mathew for help in catching
this issue.

build: Bump version for next release.

build: Bump version for next release.

ck_hs: Fix ck_hs_next to check key value.

ck_epoch: No need for the fence on synchronize for TSO.

We still require a CAS on fast path, which acts as serializing.

ck_{rw,byte,br}lock: Serialize final loads with respect to read.

I will switch to a SPARC-style barrier interface.

ck_ring: Do not use volatile load for parametric ck_ring_size.

build: Bump version for next release.