MFC r327875,r327905,r327914:
mtx: use fcmpset to cover setting MTX_CONTESTED
rwlock: try regular read unlock even in the hard path Saves on turnstile trips if the lock got more readers.
sx: retry hard shared unlock just like in r327905 for rwlocks
MFC r327875,r327905,r327914: Tags None Referenced Files None Subscribers None
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