d675b58 Auto-sync with upstream branch release/2.27/master

Authored and Committed by fweimer 5 years ago
    Auto-sync with upstream branch release/2.27/master
    
    Upstream commit: 2794474c655a0f895862a6de9fb79a2fd2cdde28
    
    - powerpc: missing CFI register information in __mpn_* functions (swbz#23614)
    - malloc: Implement tcache double free check (#1647395)
    - inet/tst-if_index-long: New test case for CVE-2018-19591 (swbz#23927)
    - elf: Fix _dl_profile_fixup data-dependency issue (swbz#23690)
    
        
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