Auto-sync with upstream branch master
    
    Upstream commit: f6e965ee94b37289f64ecd3253021541f7c214c3
    
    - powerpc: AT_HWCAP2 bit PPC_FEATURE2_HTM_NO_SUSPEND
    - aarch64: Add HWCAP_DCPOP bit
    - ttyname, ttyname_r: Don't bail prematurely (swbz#22145)
    - signal: Optimize sigrelse implementation
    - inet: Check length of ifname in if_nametoindex (swbz#22442)
    - malloc: Account for all heaps in an arena in malloc_info (swbz#22439)
    - malloc: Add missing arena lock in malloc_info (swbz#22408)
    - malloc: Use __builtin_tgmath in tgmath.h with GCC 8 (swbz#21660)
    - locale: Replaced unicode sequences in the ASCII printable range
    - resolv: More precise checks in res_hnok, res_dnok (swbz#22409, swbz#22412)
    - resolv: ns_name_pton should report trailing \ as error (swbz#22413)
    - locale: mfe_MU, miq_NI, an_ES, kab_DZ, om_ET: Escape / in d_fmt (swbz#22403)