[llvm] [CodeGen] Add MachineRegisterClassInfo analysis pass (PR #120690)

[Matt Arsenault via llvm-commits]

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@@ -594,6 +596,7 @@ void RegisterCoalescer::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addRequired<MachineLoopInfoWrapperPass>();
   AU.addPreserved<MachineLoopInfoWrapperPass>();
   AU.addPreservedID(MachineDominatorsID);
+  AU.addRequired<MachineRegisterClassInfoWrapperPass>();
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arsenm wrote:

Need to addPreserved in a lot more places? Maybe it belongs in the default MachineFunction getAnalysisUsage, though AMDGPU has a few passes that touch the set of reserved registers 

https://github.com/llvm/llvm-project/pull/120690