[NewPM/CodeGen] Rewrite pass manager nesting (#81068)

Currently the new PM infra for codegen puts everything into a
MachineFunctionPassManager. The MachineFunctionPassManager owns both
Module passes and MachineFunction passes, and batches adjacent
MachineFunction passes like a typical PassManager.

The current MachineFunctionAnalysisManager also directly references a
module and function analysis manager to get results.

The initial argument was that the codegen pipeline is relatively "flat",
meaning it's mostly machine function passes with a couple of module
passes here and there. However, there are a couple of issues with this
as compared to a more structured nesting more like the optimization
pipeline. For example, it doesn't allow running function passes then
machine function passes on a function and its machine function all at
once. It also currently requires the caller to split out the IR passes
into one pass manager and the MIR passes into another pass manager.

This patch rewrites ...