[llvm] [NewPM][CodeGen][WIP] Add callback style CodeGen pass pipeline builder (PR #104725)

[Matt Arsenault via llvm-commits]

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@@ -836,6 +848,8 @@ class ModuleToFunctionPassAdaptor
 
   static bool isRequired() { return true; }
 
+  void eraseIf(function_ref<bool(StringRef)> Pred) { Pass->eraseIf(Pred); }
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arsenm wrote:

What is this for exactly? I'd hope we don't have to prune out unwanted pre-added passes 

https://github.com/llvm/llvm-project/pull/104725