5fff012 Auto-sync with upstream branch release/2.29/master

Authored and Committed by fweimer 5 years ago
    Auto-sync with upstream branch release/2.29/master
    
    Upstream commit: c096b008d2671028c21ac8cf01f18a2083e73c44
    
    - nptl: Avoid fork handler lock for async-signal-safe fork (swbz#24161)
    - nptl: Add compiler barriers in pthread_mutex_trylock (swbz#24180)
    
        
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