[llvm] build_llvm_release.bat: add tarball export to x64 release (PR #79840)

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=?utf-8?q?Benoît?= Amiaux <benoit.amiaux at gmail.com>,
=?utf-8?q?Benoît?= Amiaux <benoit.amiaux at gmail.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/79840 at github.com>


https://github.com/zmodem approved this pull request.

LGTM

> I don't think it matters much, the file format is supported by 7z, and this tarball is primarily intended for developers.

All right, let's stick with .tar.xz.

> Let me know if you prefer to have a squashed PR

No, that's fine. We'll squash when merging.

Do you have commit access or would you like me to merge this for you?

https://github.com/llvm/llvm-project/pull/79840