[llvm] [NewPM][CodeGen] Port MachineLICM to NPM (PR #107376)

[Matt Arsenault via llvm-commits]

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@@ -126,6 +127,8 @@ namespace {
     TargetSchedModel SchedModel;
     bool PreRegAlloc = false;
     bool HasProfileData = false;
+    Pass *LegacyPass;
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arsenm wrote:

What are these ultimately used for? It's pretty ugly to need to forward these through. 

https://github.com/llvm/llvm-project/pull/107376