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

[Matt Arsenault via llvm-commits]

================
@@ -59,59 +62,110 @@ cl::opt<unsigned> EvictInterferenceCutoff(
 #define LLVM_HAVE_TF_AOT
 #endif
 
-char RegAllocEvictionAdvisorAnalysis::ID = 0;
-INITIALIZE_PASS(RegAllocEvictionAdvisorAnalysis, "regalloc-evict",
+char RegAllocEvictionAdvisorAnalysisLegacy::ID = 0;
+INITIALIZE_PASS(RegAllocEvictionAdvisorAnalysisLegacy, "regalloc-evict",
                 "Regalloc eviction policy", false, true)
 
 namespace {
-class DefaultEvictionAdvisorAnalysis final
-    : public RegAllocEvictionAdvisorAnalysis {
+class DefaultEvictionAdvisorProvider final
+    : public RegAllocEvictionAdvisorProvider {
 public:
-  DefaultEvictionAdvisorAnalysis(bool NotAsRequested)
-      : RegAllocEvictionAdvisorAnalysis(AdvisorMode::Default),
-        NotAsRequested(NotAsRequested) {}
+  DefaultEvictionAdvisorProvider(bool NotAsRequested, LLVMContext &Ctx)
+      : RegAllocEvictionAdvisorProvider(AdvisorMode::Default, Ctx) {
+    if (NotAsRequested)
+      Ctx.emitError("Requested regalloc eviction advisor analysis "
+                    "could not be created. Using default");
+  }
 
   // support for isa<> and dyn_cast.
-  static bool classof(const RegAllocEvictionAdvisorAnalysis *R) {
+  static bool classof(const RegAllocEvictionAdvisorProvider *R) {
     return R->getAdvisorMode() == AdvisorMode::Default;
   }
 
-private:
   std::unique_ptr<RegAllocEvictionAdvisor>
   getAdvisor(const MachineFunction &MF, const RAGreedy &RA) override {
     return std::make_unique<DefaultEvictionAdvisor>(MF, RA);
   }
+};
+
+class DefaultEvictionAdvisorAnalysisLegacy final
+    : public RegAllocEvictionAdvisorAnalysisLegacy {
+public:
+  DefaultEvictionAdvisorAnalysisLegacy(bool NotAsRequested)
+      : RegAllocEvictionAdvisorAnalysisLegacy(AdvisorMode::Default),
+        NotAsRequested(NotAsRequested) {}
+
+  std::unique_ptr<RegAllocEvictionAdvisorProvider>&
+  getProvider() override {
+    // MBFI and Loops not required here.
+    return Provider;
+  }
+
   bool doInitialization(Module &M) override {
-    if (NotAsRequested)
-      M.getContext().emitError("Requested regalloc eviction advisor analysis "
-                               "could not be created. Using default");
-    return RegAllocEvictionAdvisorAnalysis::doInitialization(M);
+    Provider.reset(
+        new DefaultEvictionAdvisorProvider(NotAsRequested, M.getContext()));
+    return false;
+  }
+
+  // support for isa<> and dyn_cast.
+  static bool classof(const RegAllocEvictionAdvisorAnalysisLegacy *R) {
+    return R->getAdvisorMode() == AdvisorMode::Default;
   }
+
+private:
   const bool NotAsRequested;
 };
 } // namespace
 
-template <> Pass *llvm::callDefaultCtor<RegAllocEvictionAdvisorAnalysis>() {
+AnalysisKey RegAllocEvictionAdvisorAnalysis::Key;
+
+void RegAllocEvictionAdvisorAnalysis::initializeProvider(
+    RegAllocEvictionAdvisorAnalysisLegacy::AdvisorMode Mode, LLVMContext &Ctx) {
+  if (Provider)
+    return;
+  if (Mode == RegAllocEvictionAdvisorAnalysisLegacy::AdvisorMode::Default)
+    Provider.reset(
+        new DefaultEvictionAdvisorProvider(/*NotAsRequested*/ false, Ctx));
+  else
+    initializeMLProvider(Mode, Ctx);
+  if (!Provider)
+    Provider.reset(
+        new DefaultEvictionAdvisorProvider(/*NotAsRequested*/ true, Ctx));
----------------
arsenm wrote:

```suggestion
    Provider.reset(
        new DefaultEvictionAdvisorProvider(/*NotAsRequested=*/ false, Ctx));
  else
    initializeMLProvider(Mode, Ctx);
  if (!Provider)
    Provider.reset(
        new DefaultEvictionAdvisorProvider(/*NotAsRequested=*/ true, Ctx));
```

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