387c321 Auto-sync with upstream release/2.25/master

Authored and Committed by fweimer 6 years ago
    Auto-sync with upstream release/2.25/master
    
    Upstream commit: bc5ace67fe9823757532e0273f6c1cdfda065433
    
    - mutex: Fix robust mutex lock acquire (#1485900)
    - rwlock: Fix explicit hand-over (swbz#21298)
    
        
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