Do a full-barrier when spinlock logging is configured, it cuts down on
the number of races.

Add statistics to track the number of spinlock acquisitions.
Make memory statistics sort together, get rid of most of the uses of
"total", it doesn't add information for connection-only statistics.
lint, cleanup, style.
Be more aggressive in ignoring spinlock mutexes we don't care about, ignore
up to 10 acquisitions a second.