[llvm] [CodeGen] Support MachineFunctionProperties in PassConcept (PR #79749)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

I'm still looking at this but I think https://github.com/llvm/llvm-project/commit/100fc8cb4148ec18c4db7c3c383a403b5205d8ad goes along a better path of separating out module/function passes, matching the rest of the new pass manager infra. Let me spend some more time on it.

This might take a couple of days. In the meantime I think it'd be valuable to figure out a couple of things:
* which backend is the simplest that we could get working end to end (fewest number of required passes)
  * it would really be nice to get something end to end working so we can redesign things now if we hit issues before adding too many extra features
* which passes use doInitialization/doFinalization, and is it possible to get rid of them by moving them into dedicated module passes (like you did for MIRPrinter)
  * AsmPrinter is probably the worst, we might need to split it into a pre-function module printer pass, function printer pass, and post-function module printer pass. if it's too ugly to split up, we might not be able to get rid of doInitialization/doFinalization

https://github.com/llvm/llvm-project/pull/79749