[llvm] [BOLT] Support runtime library hook via DT_INIT_ARRAY (PR #167467)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

Given the recent [discussion](https://github.com/llvm/llvm-project/issues/168528#issuecomment-3551973940), would it make sense for `BOLT-INSTRUMENTER` to report which hook it successfully set up?

https://github.com/llvm/llvm-project/pull/167467