[llvm] [PassManager] Support MachineFunctionProperties (PR #83668)

[Christudasan Devadasan via llvm-commits]

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@@ -64,6 +64,8 @@ extern llvm::cl::opt<bool> UseNewDbgInfoFormat;
 
 namespace llvm {
 
+class MachineFunction;
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cdevadas wrote:

We shouldn't have any of the MIR machinery in the files meant for IR. My hesitation is MIR being a target-specific entity, an edge case for a specific target might require some of its properties to be exposed here. I understand we want to have a unified PM for both IR and MIR passes in the LLC pipeline. But can't we have a separate folder to accommodate designs common to IR and MIR infrastructure?

https://github.com/llvm/llvm-project/pull/83668