[llvm] [BOLT] Fix runOnEachFunctionWithUniqueAllocId (PR #90039)

[Kristof Beyls via llvm-commits]

kbeyls wrote:

The one precommit test failure on `buildkite/github-pull-requests` looks exactly the same as on this other recent BOLT-related PR #90004  (RISCV/fake-label-no-entry.c). Therefore, It seems that the precommit test failure is not related to the patch in this PR.

https://github.com/llvm/llvm-project/pull/90039