update CI tarballs to LLVM 18.1.8

`std.os.linux`: Add clone() implementation for mips64. (#21038)

all: Handle spirv in addition to spirv(32,64) where applicable.

std.Thread: Explain apparently pointless mips instruction in freeAndExit().

Merge pull request #21019 from alexrp/target-os-cleanup

llvm: Disable lowering to f16 on s390x.

llvm: Disable lowering to f128 on sparc32.

compiler-rt: Fix the leoncasa CPU feature check for sparc32.

std.os.linux.tls: Support sparc32.

std.os.linux: Fix definition of tc_lflag_t on MIPS

std.zig.target: Add missing thumbeb triples.

fix C type corresponding to f80

std.Target: Some corrections and additions to stackAlignment().

std.os.linux.start_pie: Add support for the new RELR relocation format.

Merge pull request #20985 from alexrp/gpu-nonsense

std.Target: Add goff and xcoff to ObjectFormat.

Merge pull request #20964 from mlugg/the-great-decl-split-mk2

Merge pull request #21021 from alexrp/target-os-versions

Merge pull request #21018 from ziglang/behavior-test-extern-disable

loongarch: add __clear_cache builtin implementation (#21008)

std.crypto: better names for everything in utils

std.os.linux: Retranslate and port some ioctl-related types and values.

Merge pull request #21004 from alexrp/linux-6.10

fix(fmt): remove additional trailing newline

Merge pull request #21006 from ziglang/fuzz

Merge pull request #20993 from alexrp/glibc-2-40

Compilation: Mark .c++ files as having C++ extension

std: add loongarch64 support (#20915)

std.hash_map: adding a rehash() method (#19923)

Merge pull request #20997 from xxxbxxx/debuglink

language: add module name field to `@src`

std.posix: read on timerfd can return error.Canceled

generate_c_size_and_align_checks: Remove extraneous newline

Merge pull request #20969 from alexrp/llvm-unsup-targets

Merge pull request #20975 from squeek502/cpu-features-update

Merge pull request #20973 from ziglang/fix-json-utf8

build runner: output hint when no --port provided

Merge pull request #20971 from ziglang/elf-ownership-2

loongarch: various architecture specific fixes (#20912)

POSIX link() syscall only takes two arguments (no flags)

Add getppid to std.c and std.os.linux.

Merge pull request #20512 from aikawayataro/add-v-linker-arg

Merge pull request #20958 from ziglang/fuzz

std.os.linux: Move clone() here and stop exporting it.

Merge pull request #20922 from alexrp/vdso

Merge pull request #20909 from alexrp/glibc-riscv

Merge pull request #20925 from alexrp/windows-tls

start: Add sparc32 support.

std.os.linux.start_pie: Add sparc/sparc64 support.

Merge pull request #20894 from alexrp/target-cleanup-4

process_headers: Add arc-linux-gnu.

std.crypto.ecdsa: use separate function for null seed (#20953)

std.zig.target: Add arc-linux-gnu.

Make Type.intAbiAlignment match LLVM alignment for x86-windows target

std.Target: Some corrections and additions to charSignedness().

cmake: add ZIG_EXTRA_BUILD_ARGS option

musl: Disable warnings in all compilations.

Merge pull request #20960 from alexrp/size-align-fixes

Merge pull request #20951 from ehaas/c-size-and-align-check

Merge pull request #20949 from ziglang/update-glibc-abilists

Rewrite `generate_linux_syscalls.zig` (#20895)

Merge pull request #20934 from alexrp/sparc32-leon3

std.zig.target: Set minimum glibc version for csky to 2.29.

std.sort: Remove key argument from binary-search-like functions (#20927)

Add loongarch 64 to gen_stubs.zig.

std.Target: Specify dynamic linker and C type sizes for serenity

Merge pull request #20908 from ziglang/reorg-std.debug-again

Merge pull request #20906 from alexrp/repro-windows

Merge pull request #20903 from ziglang/dwarf-reorg

std.os.linux: Unbreak the build

Merge pull request #20797 from alexrp/start-more-arches

Merge pull request #20870 from alexrp/target-cleanup-3

Merge pull request #20869 from alexrp/linux-syscalls

Merge pull request #20857 from alexrp/tls-porting

Merge pull request #20772 from alexrp/linux-audit

std.Target: Handle loongarch in Os.Tag.archName().

std.atomic: Don't lie to the compiler about memory clobbers in spinLoopHint().

std.Target: Use hexagonv60 as the baseline CPU model for hexagon.

Merge pull request #20823 from alexrp/start-pie-mips-ppc

Merge pull request #20872 from alexrp/riscv-gp

Merge pull request #20884 from Rexicon226/riscv

Merge pull request #20885 from ziglang/simplify-tokenizer

Merge pull request #20878 from tiehuis/std-math-complex-fixes

Merge pull request #20883 from ehaas/aro-translate-c-no-panic

riscv: implement non-pow2 indirect loads

std: fix long double size for loongarch.

std: set standard dynamic linker path for loongarch64 on linux. (#20726)

Merge pull request #20873 from ziglang/elf-ownership

Merge pull request #20852 from ziglang/init-array-start-code

Merge pull request #20389 from alexrp/riscv32

langref: Make pointer_coerce_const_optional test less obfuscated

Fix compile error due to GetModuleFileNameW binding change

Merge pull request #20865 from ehaas/aro-translate-c-static-assert

c: Handle armeb and thumbeb in clone().

Merge pull request #20822 from alexrp/start-mips-fixes

Merge pull request #20839 from alexrp/musl-stuff

compiler: Enable -Werror=date-time for C/C++ code in release builds.

Merge pull request #20841 from alexrp/atomic-stuff

Merge pull request #19833 from tealsnow/posix-INVAL

chore: correct non-standard comments.