Auto-sync with upstream branch master
    
    Upstream commit: f01a61e13872109b3b233158ab664364bd1879bc
    
    - Drop glibc-rh819430.patch; fixed upstream.
    - i386: Regenerate ulps
    - x86: Add CPU-specific diagnostics to ld.so --list-diagnostics
    - x86: Automate generation of PREFERRED_FEATURE_INDEX_1 bitfield
    - ld.so: Implement the --list-diagnostics option
    - powerpc: Update libm-test-ulps
    - tst: Add test for utimes
    - tst: Add test for utime
    - tst: Add test for futimens
    - nptl: __libc_cleanup_push/__libc_cleanup_pop require -fexceptions
    - elf: Build __dl_iterate_phdr with unwinding support [BZ #27498]
    - nptl: Use <unwind-link.h> for accessing the libgcc_s unwinder
    - Implement _Unwind_Resume in libc on top of <unwind-link.h>
    - Move sysdeps/gnu/unwind-resume.c to sysdeps/generic/unwind-resume.c
    - __frame_state_for: Use <unwind-link.h> for unwinder access
    - sparc: Implement backtrace on top <unwind-link.h>
    - m68k: Implement backtrace on top of <unwind-link.h>
    - i386: Implement backtrace on top of <unwind-link.h>
    - arm: Implement backtrace on top of <unwind-link.h>
    - backtrace: Implement on top of <unwind-link.h>
    - Implement <unwind-link.h> for dynamically loading the libgcc_s unwinder
    - Correct buffer end pointer in IO_wdefault_doallocate (BZ #26874)
    - aarch64: update ulps.
    - Add inputs that generate larger error bounds
    - Reduce the statically linked startup code [BZ #23323]
    - posix: Falling back to non wide mode in case of encoding error [BZ #14185]
    - nptl: Move elision implementations into libc
    - NEWS: Add missing bug closures
    - added rt to malloc/Depend [BZ #27132]
    - x86: Use x86/nptl/pthreaddef.h
    - nptl: Move futex-internal into libc
    - nptl: Move lowlevellock into libc [BZ #15648]
    - nptl: Move futex-internal.c into main nptl directory
    - nptl: Reformat Versions
    - nptl: Split libpthread-routines into one routine per line
    - x86: Remove unused variables for raw cache sizes from cacheinfo.h
    - Use Linux 5.11 in build-many-glibcs.py.
    - <bits/platform/x86.h>: Correct x86_cpu_TBM
    - x86_64/clone.S: Upate comments
    - i386/clone.S: Remove redundant EBX load
    - aarch64: Remove the unused __read_tp symbol
    - build-many-glibcs.py: Use make -O for more consistent log output