Auto-sync with upstream branch master
    
    Upstream commit: 9469261cf1924d350feeec64d2c80cafbbdcdd4d
    
    - Drop glibc-benchtests-aarch64.patch; fix applied upstream
    
    - x86: Only align destination to 1x VEC_SIZE in memset 4x loop
    - elf: Fix TLS modid reuse generation assignment (BZ 29039)
    - Add TCP_MD5SIG_FLAG_IFINDEX from Linux 5.6 to netinet/tcp.h.
    - elf: Relocate libc.so early during startup and dlmopen (bug 31083)
    - elf: Introduce the _dl_open_relocate_one_object function
    - elf: In _dl_relocate_object, skip processing if object is relocated
    - Remove __access_noerrno
    - malloc: Use __get_nprocs on arena_get2 (BZ 30945)
    - aarch64: Fix libmvec benchmarks