[llvm] [BOLT][AArch64] Add support for compact code model (PR #112110)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

@smithp35, thank you for the feedback. One thing I didn't mention in this PR, is that I plan follow-up PRs with the support for >128MB binaries via stubs/thunks/veneers. Ideally, it would be done in JITLink. Regarding unit tests, yes, they are not as comprehensive as I would like them to be and often we rely on regression tests where we continuously build large binaries. However, we don't have that many regression tests for AArch64 at the moment.

@lhames, do you know if anyone is working (or has plans) on AArch64 call relaxation in JITLink?

https://github.com/llvm/llvm-project/pull/112110