[llvm] [CodeGen] Add listener support to the rematerializer (NFC) (PR #184338)

[Nicolai Hähnle via llvm-commits]

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@@ -207,6 +238,11 @@ class Rematerializer {
   /// rematerializable register in regions.
   bool analyze(bool SupportRollback);
 
+  /// Adds a listener to the rematerializer.
+  void addListener(Listener *Listen) { Listeners.push_back(Listen); }
+  /// Removes all listeners from the rematerializers.
+  void clearListeners(Listener *Listen) { Listeners.clear(); }
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nhaehnle wrote:

This method should not have an argument.

https://github.com/llvm/llvm-project/pull/184338