Auto-sync with upstream branch master
    
    Upstream commit: b6e3898194bbae78910bbe9cd086937014961e45
    
    - x86-64: Simplify minimum ISA check ifdef conditional with if
    - manual/tunables - Add entry for enable_secure tunable.
    - NEWS: Move enable_secure_tunable from 2.39 to 2.40.
    - riscv: Add and use alignment-ignorant memcpy
    - riscv: Add ifunc helper method to hwprobe.h
    - riscv: Enable multi-arg ifunc resolvers
    - riscv: Add __riscv_hwprobe pointer to ifunc calls
    - riscv: Add hwprobe vdso call support
    - linux: Introduce INTERNAL_VSYSCALL
    - riscv: Add Linux hwprobe syscall support
    - rtld: Add glibc.rtld.enable_secure tunable.
    - x86-64: Update _dl_tlsdesc_dynamic to preserve AMX registers
    - x86_64: Suppress false positive valgrind error
    - x86: Don't check XFD against /proc/cpuinfo
    - x86-64: Don't use SSE resolvers for ISA level 3 or above
    - x86: Update _dl_tlsdesc_dynamic to preserve caller-saved registers
    - sysdeps/unix/sysv/linux/x86_64/Makefile: Add the end marker
    - cdefs: Drop access attribute for _FORTIFY_SOURCE=3 (BZ #31383)
    - s390: Improve static-pie configure tests
    - x86: Change ENQCMD test to CHECK_FEATURE_PRESENT
    - debug: Improve mqueue.h fortify warnings with clang
    - debug: Improve fcntl.h fortify warnings with clang
    - wcsmbs: Improve fortify with clang
    - syslog: Improve fortify with clang
    - socket: Improve fortify with clang
    - unistd: Improve fortify with clang
    - stdlib: Improve fortify with clang
    - string: Improve fortify with clang
    - libio: Improve fortify with clang
    - cdefs.h: Add clang fortify directives
    - Update SHARED-FILES and license for Unicode 15.1.0.
    - aarch64/fpu: Sync libmvec routines from 2.39 and before with AOR
    - S390: Do not clobber r7 in clone [BZ #31402]
    - x86_64: Exclude SSE, AVX and FMA4 variants in libm multiarch
    - hurd: Reformat Makefile.
    - htl/tests: Reformat Makefile.
    - htl: Reformat Makefile.
    - hesiod: Reformat Makefile.
    - gmon: Reformat Makefile.
    - dlfcn: Reformat Makefile.
    - dirent: Reformat Makefile.
    - ctype: Reformat Makefile.
    - csu: Reformat Makefile.
    - conform: Reformat Makefile.
    - Support compiling .S files with additional options
    - x86-64: Save APX registers in ld.so trampoline
    - benchtests: Add more benchtests for rounding functions.
    - tests: gracefully handle AppArmor userns containment
    - treewide: python-scripts: use `is None` for none-equality
    - powerpc: Remove power7 strstr optimization
    - arm: Use _dl_find_object on __gnu_Unwind_Find_exidx (BZ 31405)
    - math: Update mips64 ulps