[llvm] [bolt][aarch64] Change indirect call instrumentation snippet (PR #180229)

[Alexey Moksyakov via llvm-commits]

yavtuk wrote:

@yozhu @paschalis-mpeis  Can you verify the current changes on your sites?
I've reduced the instrumentation indirect snippet as much as possible

https://github.com/llvm/llvm-project/pull/180229