K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2017-02-07T17:04:31.032778Z
K 7
svn:log
V 171
rwlock: implement RW_LOCK_WRITER_RECURSED bit

This moves recursion handling out of the inlined wunlock path and in
particular saves a read and a branch.

Discussed with:

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