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

[via llvm-commits]

================
@@ -287,7 +287,16 @@ ninja check-sanitizer || ninja check-sanitizer || ninja check-sanitizer || exit
 ninja check-clang-tools || ninja check-clang-tools || ninja check-clang-tools || exit /b 1
 ninja check-clangd || ninja check-clangd || ninja check-clangd || exit /b 1
 ninja package || exit /b 1
+
+:: generate tarball with install toolchain only off
+set filename=clang+llvm-%version%-x86_64-pc-windows-msvc
+cmake -GNinja %cmake_flags% -DLLVM_INSTALL_TOOLCHAIN_ONLY=OFF ^
----------------
zmodem wrote:

Shouldn't we also keep `%cmake_profile_flags%` from above?

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