================
@@ -164,40 +197,92 @@ class RegAllocEvictionAdvisor {
 ///
 /// Because we need to offer additional services in 'development' mode, the
 /// implementations of this analysis need to implement RTTI support.
-class RegAllocEvictionAdvisorAnalysis : public ImmutablePass {
+class RegAllocEvictionAdvisorAnalysisLegacy : public ImmutablePass {
 public:
   enum class AdvisorMode : int { Default, Release, Development };
 
-  RegAllocEvictionAdvisorAnalysis(AdvisorMode Mode)
-      : ImmutablePass(ID), Mode(Mode){};
+  RegAllocEvictionAdvisorAnalysisLegacy(AdvisorMode Mode)
+      : ImmutablePass(ID), Mode(Mode) {};
   static char ID;
 
   /// Get an advisor for the given context (i.e. machine function, etc)
-  virtual std::unique_ptr<RegAllocEvictionAdvisor>
-  getAdvisor(const MachineFunction &MF, const RAGreedy &RA) = 0;
+  std::unique_ptr<RegAllocEvictionAdvisorProvider> &getProvider() {
+    return Provider;
+  }
----------------
arsenm wrote:

```suggestion
  RegAllocEvictionAdvisorProvider &getProvider() {
    return *Provider;
  }
```

Returning the reference to the unique_ptr is weird 

https://github.com/llvm/llvm-project/pull/117309
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