650d554 Auto-sync with upstream branch master,

Authored and Committed by djdelorie 5 years ago
    Auto-sync with upstream branch master,
    
    commit 6bbfc5c09fc5b5e3d4a0cddbbd4e2e457767dae7.
    
    - Add statx conditionals for wordsize-32 *xstat.c
    - regex: fix storage-exhaustion error (swbz#18040)
    - regex: fix heap-use-after-free error (swbz#18040)
    - manual: Document thread/task IDs for Linux
    
        
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