Auto-sync with upstream branch release/2.28/master,
    
    Upstream commit: 7423da211d1490d9fc76c2f0ce49e5dd90ea9bcc.
    
    - ja_JP locale: Add entry for the new Japanese era [BZ #22964]
    - S390: Mark vx and vxe as important hwcap.
    - Record CVE-2019-9169 in NEWS and ChangeLog [BZ #24114]
    - regex: fix read overrun [BZ #24114]
    - RISC-V: don't assume PI mutexes and robust futexes before 4.20 (bug 23864)
    - powerpc: Only enable TLE with PPC_FEATURE2_HTM_NOSC
    - RISC-V: Fix elfutils testsuite unwind failures.
    - nptl: Fix pthread_rwlock_try*lock stalls (Bug 23844)
    - nptl: Avoid fork handler lock for async-signal-safe fork [BZ #24161]
    - Add compiler barriers around modifications of the robust mutex list for pthread_mutex_trylock. [BZ #24180]
    - NEWS: Mention bug 24112.
    - nscd: Do not use __inet_aton_exact@GLIBC_PRIVATE [BZ #20018]
    - CVE-2016-10739: getaddrinfo: Fully parse IPv4 address strings [BZ #20018]
    - resolv: Do not send queries for non-host-names in nss_dns [BZ #24112]
    - resolv: Reformat inet_addr, inet_aton to GNU style
    - x86-64 memcmp: Use unsigned Jcc instructions on size [BZ #24155]
    - x86-64 strnlen/wcsnlen: Properly handle the length parameter [BZ #24097]
    - x86-64 strncpy: Properly handle the length parameter [BZ #24097]
    - x86-64 strncmp family: Properly handle the length parameter [BZ #24097]
    - x86-64 memset/wmemset: Properly handle the length parameter [BZ #24097]
    - x86-64 memrchr: Properly handle the length parameter [BZ #24097]
    - x86-64 memcpy: Properly handle the length parameter [BZ #24097]
    - x86-64 memcmp/wmemcmp: Properly handle the length parameter [BZ #24097]
    - x86-64 memchr/wmemchr: Properly handle the length parameter [BZ #24097]
    - Add XFAIL_ROUNDING_IBM128_LIBGCC to more fma() tests
    - Only build libm with -fno-math-errno (bug 24024)
    - sysdeps/ieee754/soft-fp: ignore maybe-uninitialized with -O [BZ #19444]
    - ARM: fix kernel assisted atomics with GCC 8 (bug 24034)
    - riscv: Use __has_include__ to include <asm/syscalls.h> [BZ #24022]
    - intl: Do not return NULL on asprintf failure in gettext [BZ #24018]
    - malloc: Always call memcpy in _int_realloc [BZ #24027]
    - Update Alpha libm-test-ulps
    - m68k: Fix sigaction kernel definition (BZ #23967)
    - RISC-V: properly terminate call chain (bug 23125)
    - support: Do not require overflow builtin in support/blob_repeat.c