[NewPM] Remove CFGViewerLegacyPass (#73410)

This pass isn't used anywhere upstream, has a NewPM equivalent, and has
no test coverage. For these reasons, remove it.

Author: boomanaiden154

llvm/include/llvm/InitializePasses.h

@@ -71,7 +71,6 @@ void initializeCFGPrinterLegacyPassPass(PassRegistry&);
 void initializeCFGSimplifyPassPass(PassRegistry&);
 void initializeCFGuardPass(PassRegistry&);
 void initializeCFGuardLongjmpPass(PassRegistry&);
-void initializeCFGViewerLegacyPassPass(PassRegistry&);
 void initializeCFIFixupPass(PassRegistry&);
 void initializeCFIInstrInserterPass(PassRegistry&);
 void initializeCallBrPreparePass(PassRegistry &);

llvm/lib/Analysis/Analysis.cpp

@@ -24,7 +24,6 @@ void llvm::initializeAnalysis(PassRegistry &Registry) {
   initializeCallGraphWrapperPassPass(Registry);
   initializeCallGraphDOTPrinterPass(Registry);
   initializeCallGraphViewerPass(Registry);
-  initializeCFGViewerLegacyPassPass(Registry);
   initializeCFGPrinterLegacyPassPass(Registry);
   initializeCFGOnlyViewerLegacyPassPass(Registry);
   initializeCFGOnlyPrinterLegacyPassPass(Registry);

llvm/lib/Analysis/CFGPrinter.cpp

@@ -92,37 +92,6 @@ static void viewCFG(Function &F, const BlockFrequencyInfo *BFI,
   ViewGraph(&CFGInfo, "cfg." + F.getName(), CFGOnly);
 }
 
-namespace {
-struct CFGViewerLegacyPass : public FunctionPass {
-  static char ID; // Pass identifcation, replacement for typeid
-  CFGViewerLegacyPass() : FunctionPass(ID) {
-    initializeCFGViewerLegacyPassPass(*PassRegistry::getPassRegistry());
-  }
-
-  bool runOnFunction(Function &F) override {
-    if (!CFGFuncName.empty() && !F.getName().contains(CFGFuncName))
-      return false;
-    auto *BPI = &getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI();
-    auto *BFI = &getAnalysis<BlockFrequencyInfoWrapperPass>().getBFI();
-    viewCFG(F, BFI, BPI, getMaxFreq(F, BFI));
-    return false;
-  }
-
-  void print(raw_ostream &OS, const Module * = nullptr) const override {}
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    FunctionPass::getAnalysisUsage(AU);
-    AU.addRequired<BlockFrequencyInfoWrapperPass>();
-    AU.addRequired<BranchProbabilityInfoWrapperPass>();
-    AU.setPreservesAll();
-  }
-};
-} // namespace
-
-char CFGViewerLegacyPass::ID = 0;
-INITIALIZE_PASS(CFGViewerLegacyPass, "view-cfg", "View CFG of function", false,
-                true)
-
 PreservedAnalyses CFGViewerPass::run(Function &F, FunctionAnalysisManager &AM) {
   if (!CFGFuncName.empty() && !F.getName().contains(CFGFuncName))
     return PreservedAnalyses::all();