[llvm] [BOLT] Make instruction size a first-class annotation (PR #72167)

[Maksim Panchenko via llvm-commits]

maksfb wrote:

> Do you think it will have any impact on BOLT's max RSS? If so, it would make sense to enable [llvm/llvm-zorg#70](https://github.com/llvm/llvm-zorg/pull/70)

If there is, there will be a negligible reduction in max RSS.

https://github.com/llvm/llvm-project/pull/72167