Auto-sync with upstream branch release/2.28/master
    
    Upstream commit: ea16a6938d7ca5f4c2b67c11251c70b30796602a
    
    - malloc: Add additional test case for tcache double free check (#1647395)
    - inet/tst-if_index-long: New test case for CVE-2018-19591 (swbz#23927)
    - compat getdents64: Use correct offset for retry (swbz#23972)
    - elf: Fix _dl_profile_fixup data-dependency issue (swbz#23690)