[llvm] Unify x64 and arm64 build process in build_llvm_release.bat (PR #131687)

[Hans Wennborg via llvm-commits]

https://github.com/zmodem commented:

Thanks!

I didn't actually try it, but this basically lgtm with the check-sanitizer comment addressed.

https://github.com/llvm/llvm-project/pull/131687