[llvm] [CodeGen][NewPM] Port RegAllocEvictionAdvisor analysis to NPM (PR #117309)

[Matt Arsenault via llvm-commits]

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@@ -535,7 +535,28 @@ class DevelopmentModeEvictionAdvisorAnalysis final
 
     Log = std::make_unique<Logger>(std::move(OS), LFS, Reward,
                                    /*IncludeReward*/ true);
-    return false;
+    return;
+  }
+
+  // support for isa<> and dyn_cast.
+  static bool classof(const RegAllocEvictionAdvisorProvider *R) {
+    return R->getAdvisorMode() == AdvisorMode::Development;
+  }
+
+  void logRewardIfNeeded(const MachineFunction &MF,
+                         llvm::function_ref<float()> GetReward) override {
+    if (!Log || !Log->hasAnyObservationForContext(MF.getName()))
+      return;
+    // The function pass manager would run all the function passes for a
+    // function, so we assume the last context belongs to this function. If
+    // this invariant ever changes, we can implement at that time switching
+    // contexts. At this point, it'd be an error
+    if (Log->currentContext() != MF.getName()) {
+      MF.getFunction().getContext().emitError(
+          "The training log context shouldn't have had changed.");
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arsenm wrote:

Don't use contractions in error messages (but this is probably preexisting)

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