CI: update x86_64 and aarch64 LLVM tarballs with assertions enabled

[andrewrk]

These tarballs were built with -DLLVM_ENABLE_ASSERTIONS=ON.

[andrewrk]

@Vexu, it looks like this regressed with #13914:

Assertion failed: Subtarget->isTargetDarwin() && "automatic va_arg instruction only works on Darwin" (/home/andy/dev/zig-bootstrap/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp: LowerVAARG: 8598)
error: test...
error: The following command terminated unexpectedly:
/home/ci/actions-runner9/_work/zig/zig/build-debug/stage3-debug/bin/zig test /home/ci/actions-runner9/_work/zig/zig/test/behavior.zig -lc --test-name-prefix behavior-aarch64-windows-gnu-Debug-c-multi-default  --cache-dir /home/ci/actions-runner9/_work/zig/zig/build-debug/zig-local-cache --global-cache-dir /home/ci/actions-runner9/_work/zig/zig/build-debug/zig-global-cache --name test -fno-single-threaded -target aarch64-windows-gnu -mcpu generic --test-no-exec -I /home/ci/actions-runner9/_work/zig/zig/test -L /home/ci/deps/zig+llvm+lld+clang-x86_64-linux-musl-0.11.0-dev.971+19056cb68/lib -I /home/ci/deps/zig+llvm+lld+clang-x86_64-linux-musl-0.11.0-dev.971+19056cb68/include --zig-lib-dir /home/ci/actions-runner9/_work/zig/zig/lib --enable-cache 

Edit: failing test disabled in a1d8235