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

[Wu Yingcong via llvm-commits]

https://github.com/yingcong-wu created https://github.com/llvm/llvm-project/pull/86472

The callee should preserve rbx, but it is not in the test case `ExecutionEngine/JITLink/x86-64/ELF_vtune.s`. Not preserving the rbx register may result in some random error. This patch add the missing command to preserve the rbx.

>From d203fedc15f081fda3177866d060ccf2d9385048 Mon Sep 17 00:00:00 2001
From: "Wu, Yingcong" <yingcong.wu at intel.com>
Date: Mon, 25 Mar 2024 00:57:15 -0700
Subject: [PATCH] preserve rbp

---
 llvm/test/ExecutionEngine/JITLink/x86-64/ELF_vtune.s | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_vtune.s b/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_vtune.s
index 1c95bde51e1211..b734457c1ad7f7 100644
--- a/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_vtune.s
+++ b/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_vtune.s
@@ -20,12 +20,14 @@ main:
         .cfi_def_cfa_offset 16
         .cfi_offset 6, -16
         movq    %rsp, %rbp
+        pushq   %rbx
         .cfi_def_cfa_register 6
-        movl    %edi, -4(%rbp)
+        movl    %edi, -8(%rbp)
         movq    %rsi, -16(%rbp)
-        movl    -4(%rbp), %ebx
+        movl    -8(%rbp), %ebx
         addl    $1, %ebx
-	movl   $0, %eax
+        movl    $0, %eax
+        popq    %rbx
         popq    %rbp
         .cfi_def_cfa 7, 8
         ret