[llvm] [Test][ORC][JITLink] Preserve rbx in the test `ExecutionEngine/JITLink/x86-64/ELF_vtune.s` (PR #86472)

[Wu Yingcong via llvm-commits]

yingcong-wu wrote:

> Hi, do you mean preserve `rbx`in your PR title?

Updated, thanks.

https://github.com/llvm/llvm-project/pull/86472