[llvm] Add "override" where appropriate (NFC) (#165168)

Note that "override" makes "virtual" redundant.

Identified with modernize-use-override.

Author: kazutakahirata

llvm/include/llvm/Analysis/DDG.h

@@ -96,7 +96,7 @@ class RootDDGNode : public DDGNode {
   RootDDGNode() : DDGNode(NodeKind::Root) {}
   RootDDGNode(const RootDDGNode &N) = delete;
   RootDDGNode(RootDDGNode &&N) : DDGNode(std::move(N)) {}
-  ~RootDDGNode() = default;
+  ~RootDDGNode() override = default;
 
   /// Define classof to be able to use isa<>, cast<>, dyn_cast<>, etc.
   static bool classof(const DDGNode *N) {
@@ -114,7 +114,7 @@ class LLVM_ABI SimpleDDGNode : public DDGNode {
   SimpleDDGNode(Instruction &I);
   SimpleDDGNode(const SimpleDDGNode &N);
   SimpleDDGNode(SimpleDDGNode &&N);
-  ~SimpleDDGNode();
+  ~SimpleDDGNode() override;
 
   SimpleDDGNode &operator=(const SimpleDDGNode &N) = default;
 
@@ -176,7 +176,7 @@ class LLVM_ABI PiBlockDDGNode : public DDGNode {
   PiBlockDDGNode(const PiNodeList &List);
   PiBlockDDGNode(const PiBlockDDGNode &N);
   PiBlockDDGNode(PiBlockDDGNode &&N);
-  ~PiBlockDDGNode();
+  ~PiBlockDDGNode() override;
 
   PiBlockDDGNode &operator=(const PiBlockDDGNode &N) = default;
 
@@ -318,7 +318,7 @@ class LLVM_ABI DataDependenceGraph : public DDGBase, public DDGInfo {
       : DDGBase(std::move(G)), DDGInfo(std::move(G)) {}
   DataDependenceGraph(Function &F, DependenceInfo &DI);
   DataDependenceGraph(Loop &L, LoopInfo &LI, DependenceInfo &DI);
-  ~DataDependenceGraph();
+  ~DataDependenceGraph() override;
 
   /// If node \p N belongs to a pi-block return a pointer to the pi-block,
   /// otherwise return null.

llvm/include/llvm/Analysis/InteractiveModelRunner.h

@@ -51,7 +51,7 @@ class LLVM_ABI InteractiveModelRunner : public MLModelRunner {
     Log->flush();
   }
 
-  virtual ~InteractiveModelRunner();
+  ~InteractiveModelRunner() override;
 
 private:
   void *evaluateUntyped() override;

llvm/include/llvm/Analysis/MLInlineAdvisor.h

@@ -33,7 +33,7 @@ class MLInlineAdvisor : public InlineAdvisor {
                       GetModelRunner,
                   std::function<bool(CallBase &)> GetDefaultAdvice);
 
-  virtual ~MLInlineAdvisor() = default;
+  ~MLInlineAdvisor() override = default;
 
   void onPassEntry(LazyCallGraph::SCC *SCC) override;
   void onPassExit(LazyCallGraph::SCC *SCC) override;
@@ -105,7 +105,7 @@ class MLInlineAdvice : public InlineAdvice {
 public:
   MLInlineAdvice(MLInlineAdvisor *Advisor, CallBase &CB,
                  OptimizationRemarkEmitter &ORE, bool Recommendation);
-  virtual ~MLInlineAdvice() = default;
+  ~MLInlineAdvice() override = default;
 
   void recordInliningImpl() override;
   void recordInliningWithCalleeDeletedImpl() override;

llvm/include/llvm/Analysis/ReleaseModeModelRunner.h

@@ -106,7 +106,7 @@ class ReleaseModeModelRunner final : public MLModelRunner {
     assert(ResultIndex >= 0 && "Cannot find DecisionName in inlining model");
   }
 
-  virtual ~ReleaseModeModelRunner() = default;
+  ~ReleaseModeModelRunner() override = default;
 
   static bool classof(const MLModelRunner *R) {
     return R->getKind() == MLModelRunner::Kind::Release;

llvm/include/llvm/Analysis/StackSafetyAnalysis.h

@@ -156,7 +156,7 @@ class StackSafetyGlobalInfoWrapperPass : public ModulePass {
   static char ID;
 
   StackSafetyGlobalInfoWrapperPass();
-  ~StackSafetyGlobalInfoWrapperPass();
+  ~StackSafetyGlobalInfoWrapperPass() override;
 
   const StackSafetyGlobalInfo &getResult() const { return SSGI; }
 

llvm/include/llvm/DWARFCFIChecker/DWARFCFIFunctionFrameAnalyzer.h

@@ -32,7 +32,7 @@ class LLVM_ABI CFIFunctionFrameAnalyzer : public CFIFunctionFrameReceiver {
 public:
   CFIFunctionFrameAnalyzer(MCContext &Context, const MCInstrInfo &MCII)
       : CFIFunctionFrameReceiver(Context), MCII(MCII) {}
-  ~CFIFunctionFrameAnalyzer();
+  ~CFIFunctionFrameAnalyzer() override;
 
   void startFunctionFrame(bool IsEH,
                           ArrayRef<MCCFIInstruction> Prologue) override;

llvm/include/llvm/DWARFLinker/Classic/DWARFStreamer.h

@@ -48,7 +48,7 @@ class LLVM_ABI DwarfStreamer : public DwarfEmitter {
                 raw_pwrite_stream &OutFile,
                 DWARFLinkerBase::MessageHandlerTy Warning)
       : OutFile(OutFile), OutFileType(OutFileType), WarningHandler(Warning) {}
-  virtual ~DwarfStreamer() = default;
+  ~DwarfStreamer() override = default;
 
   static Expected<std::unique_ptr<DwarfStreamer>> createStreamer(
       const Triple &TheTriple, DWARFLinkerBase::OutputFileType FileType,

llvm/include/llvm/DWARFLinker/Parallel/DWARFLinker.h

@@ -120,7 +120,7 @@ using SectionHandlerTy =
 
 class DWARFLinker : public DWARFLinkerBase {
 public:
-  virtual ~DWARFLinker() = default;
+  ~DWARFLinker() override = default;
 
   /// Creates dwarf linker instance.
   LLVM_ABI static std::unique_ptr<DWARFLinker>

llvm/include/llvm/Debuginfod/BuildIDFetcher.h

@@ -24,7 +24,7 @@ class DebuginfodFetcher : public object::BuildIDFetcher {
 public:
   DebuginfodFetcher(std::vector<std::string> DebugFileDirectories)
       : BuildIDFetcher(std::move(DebugFileDirectories)) {}
-  virtual ~DebuginfodFetcher() = default;
+  ~DebuginfodFetcher() override = default;
 
   /// Fetches the given Build ID using debuginfod and returns a local path to
   /// the resulting file.

llvm/include/llvm/IR/DroppedVariableStatsIR.h

@@ -71,13 +71,12 @@ class LLVM_ABI DroppedVariableStatsIR : public DroppedVariableStats {
                                         StringRef PassLevel);
 
   /// Override base class method to run on an llvm::Function specifically.
-  virtual void
-  visitEveryInstruction(unsigned &DroppedCount,
-                        DenseMap<VarID, DILocation *> &InlinedAtsMap,
-                        VarID Var) override;
+  void visitEveryInstruction(unsigned &DroppedCount,
+                             DenseMap<VarID, DILocation *> &InlinedAtsMap,
+                             VarID Var) override;
 
   /// Override base class method to run on #dbg_values specifically.
-  virtual void visitEveryDebugRecord(
+  void visitEveryDebugRecord(
       DenseSet<VarID> &VarIDSet,
       DenseMap<StringRef, DenseMap<VarID, DILocation *>> &InlinedAtsMap,
       StringRef FuncName, bool Before) override;