[llvm] [AArch64][BOLT] Ensure tentative code layout for cold BBs runs. (PR #96609)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

@paschalis-mpeis, could you try the test from https://github.com/llvm/llvm-project/pull/112110 without `--compact-code-model`? It fails in JITLink (without the flag), but this PR supposedly fixes it. 

https://github.com/llvm/llvm-project/pull/96609