[llvm] [BOLT][AArch64] Fix error message for failed ADR relaxation (PR #142533)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis commented:

Hey Maksim, thanks for the patch.

With this PR we'll also have to adapt: [runtime/AArch64/adrrelaxationpass.s](https://github.com/llvm/llvm-project/blob/abec50cb9391522d7a7019d0cb040e946c8af164/bolt/test/runtime/AArch64/adrrelaxationpass.s#L13)

https://github.com/llvm/llvm-project/pull/142533