[Passes] Remove some legacy passes

Namely CrossDSOCFI and GlobalSplit.

These are part of the optimization pipeline, of which the legacy pass manager version is deprecated.

llvm/include/llvm/Transforms/IPO.h

@@ -113,13 +113,6 @@ enum class PassSummaryAction {
   Export, ///< Export information to summary.
 };
 
-/// This pass export CFI checks for use by external modules.
-ModulePass *createCrossDSOCFIPass();
-
-/// This pass splits globals into pieces for the benefit of whole-program
-/// devirtualization and control-flow integrity.
-ModulePass *createGlobalSplitPass();
-
 } // End llvm namespace
 
 #endif

llvm/lib/Transforms/IPO/CrossDSOCFI.cpp

@@ -35,28 +35,16 @@ STATISTIC(NumTypeIds, "Number of unique type identifiers");
 
 namespace {
 
-struct CrossDSOCFI : public ModulePass {
-  static char ID;
-  CrossDSOCFI() : ModulePass(ID) {
-    initializeCrossDSOCFIPass(*PassRegistry::getPassRegistry());
-  }
-
+struct CrossDSOCFI {
   MDNode *VeryLikelyWeights;
 
   ConstantInt *extractNumericTypeId(MDNode *MD);
   void buildCFICheck(Module &M);
-  bool runOnModule(Module &M) override;
+  bool runOnModule(Module &M);
 };
 
 } // anonymous namespace
 
-INITIALIZE_PASS_BEGIN(CrossDSOCFI, "cross-dso-cfi", "Cross-DSO CFI", false,
-                      false)
-INITIALIZE_PASS_END(CrossDSOCFI, "cross-dso-cfi", "Cross-DSO CFI", false, false)
-char CrossDSOCFI::ID = 0;
-
-ModulePass *llvm::createCrossDSOCFIPass() { return new CrossDSOCFI; }
-
 /// Extracts a numeric type identifier from an MDNode containing type metadata.
 ConstantInt *CrossDSOCFI::extractNumericTypeId(MDNode *MD) {
   // This check excludes vtables for classes inside anonymous namespaces.

llvm/lib/Transforms/IPO/GlobalSplit.cpp

@@ -159,33 +159,6 @@ static bool splitGlobals(Module &M) {
   return Changed;
 }
 
-namespace {
-
-struct GlobalSplit : public ModulePass {
-  static char ID;
-
-  GlobalSplit() : ModulePass(ID) {
-    initializeGlobalSplitPass(*PassRegistry::getPassRegistry());
-  }
-
-  bool runOnModule(Module &M) override {
-    if (skipModule(M))
-      return false;
-
-    return splitGlobals(M);
-  }
-};
-
-} // end anonymous namespace
-
-char GlobalSplit::ID = 0;
-
-INITIALIZE_PASS(GlobalSplit, "globalsplit", "Global splitter", false, false)
-
-ModulePass *llvm::createGlobalSplitPass() {
-  return new GlobalSplit;
-}
-
 PreservedAnalyses GlobalSplitPass::run(Module &M, ModuleAnalysisManager &AM) {
   if (!splitGlobals(M))
     return PreservedAnalyses::all();

llvm/lib/Transforms/IPO/IPO.cpp

@@ -25,13 +25,11 @@ using namespace llvm;
 void llvm::initializeIPO(PassRegistry &Registry) {
   initializeAnnotation2MetadataLegacyPass(Registry);
   initializeConstantMergeLegacyPassPass(Registry);
-  initializeCrossDSOCFIPass(Registry);
   initializeDAEPass(Registry);
   initializeDAHPass(Registry);
   initializeForceFunctionAttrsLegacyPassPass(Registry);
   initializeGlobalDCELegacyPassPass(Registry);
   initializeGlobalOptLegacyPassPass(Registry);
-  initializeGlobalSplitPass(Registry);
   initializeAlwaysInlinerLegacyPassPass(Registry);
   initializeInferFunctionAttrsLegacyPassPass(Registry);
   initializeLoopExtractorLegacyPassPass(Registry);