[llvm] [CodeGen][NewPM] Port RegisterUsageInfo to NPM (PR #113873)

[Matthias Braun via llvm-commits]

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@@ -66,6 +63,52 @@ class PhysicalRegisterUsageInfo : public ImmutablePass {
   const LLVMTargetMachine *TM = nullptr;
 };
 
+class PhysicalRegisterUsageInfoWrapperLegacy : public ImmutablePass {
+  std::unique_ptr<PhysicalRegisterUsageInfo> PRUI;
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MatzeB wrote:

>From what I remember this analysis is basically equivalent to `MachineRegisterInfo::UsedPhysRegMask` however I think for interprocedural regalloc we did not want to keep the full `MachineRegisterInfo` around for every function in the module, and that's why this simpler analysis pass exists? (and I think this analysis is not used anyway when IPRA is not enabled)

https://github.com/llvm/llvm-project/pull/113873