[llvm] [bolt][aarch64] test to reproduce the issue with ldr reg, literal (PR #165723)

[YongKang Zhu via llvm-commits]

yozhu wrote:

Thanks for the patch! Wondering if it would be useful to combine this "ldr->movk" transformation with some sort of ldr relaxation (as in #165787), particularly for cases where the constant island content has (dynamic) relocation and need to be fixed up?

https://github.com/llvm/llvm-project/pull/165723