16caa0b Auto-sync with upstream branch master

Authored and Committed by djdelorie 5 years ago
    Auto-sync with upstream branch master
    
    Upstream commit: bcdaad21d4635931d1bd3b54a7894276925d081d
    
    - malloc: tcache double free check
    - [AArch64] Adjust writeback in non-zero memset
    - Update config.guess and config.sub to current versions.
    - support: Print timestamps in timeout handler
    - Use STRFMON_LDBL_IS_DBL instead of __ldbl_is_dbl.
    
        
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