[llvm] Use "= default" (NFC) (llvm#166088)

Identified with modernize-use-equals-default.

Author: kazutakahirata

llvm/examples/Kaleidoscope/Chapter9/toy.cpp

@@ -203,7 +203,7 @@ class ExprAST {
 
 public:
   ExprAST(SourceLocation Loc = CurLoc) : Loc(Loc) {}
-  virtual ~ExprAST() {}
+  virtual ~ExprAST() = default;
   virtual Value *codegen() = 0;
   int getLine() const { return Loc.Line; }
   int getCol() const { return Loc.Col; }

llvm/examples/OptSubcommand/llvm-hello-sub.cpp

@@ -46,7 +46,7 @@ class HelloSubOptTable : public GenericOptTable {
   HelloSubOptTable()
       : GenericOptTable(OptionStrTable, OptionPrefixesTable, InfoTable,
                         /*IgnoreCase=*/false, OptionSubCommands,
-                        OptionSubCommandIDsTable) {}
+                        OptionSubCommandIDsTable) = default;
 };
 } // namespace
 

llvm/include/llvm/Analysis/DDG.h

@@ -60,11 +60,7 @@ class LLVM_ABI DDGNode : public DDGNodeBase {
   DDGNode(DDGNode &&N) : DDGNodeBase(std::move(N)), Kind(N.Kind) {}
   virtual ~DDGNode() = 0;
 
-  DDGNode &operator=(const DDGNode &N) {
-    DGNode::operator=(N);
-    Kind = N.Kind;
-    return *this;
-  }
+  DDGNode &operator=(const DDGNode &N) = default;
 
   DDGNode &operator=(DDGNode &&N) {
     DGNode::operator=(std::move(N));

llvm/include/llvm/Demangle/Utility.h

@@ -81,7 +81,7 @@ class OutputBuffer {
   OutputBuffer(const OutputBuffer &) = delete;
   OutputBuffer &operator=(const OutputBuffer &) = delete;
 
-  virtual ~OutputBuffer() {}
+  virtual ~OutputBuffer() = default;
 
   operator std::string_view() const {
     return std::string_view(Buffer, CurrentPosition);

llvm/include/llvm/ExecutionEngine/JITLink/aarch32.h

@@ -175,7 +175,7 @@ struct HalfWords {
 /// FixupInfo base class is required for dynamic lookups.
 struct FixupInfoBase {
   LLVM_ABI static const FixupInfoBase *getDynFixupInfo(Edge::Kind K);
-  virtual ~FixupInfoBase() {}
+  virtual ~FixupInfoBase() = default;
 };
 
 /// FixupInfo checks for Arm edge kinds work on 32-bit words

llvm/include/llvm/ExecutionEngine/Orc/MachOBuilder.h

@@ -36,7 +36,7 @@ size_t writeMachOStruct(MutableArrayRef<char> Buf, size_t Offset, MachOStruct S,
 
 /// Base type for MachOBuilder load command wrappers.
 struct MachOBuilderLoadCommandBase {
-  virtual ~MachOBuilderLoadCommandBase() {}
+  virtual ~MachOBuilderLoadCommandBase() = default;
   virtual size_t size() const = 0;
   virtual size_t write(MutableArrayRef<char> Buf, size_t Offset,
                        bool SwapStruct) = 0;

llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.h

@@ -29,7 +29,7 @@ namespace rt_bootstrap {
 class LLVM_ABI ExecutorSharedMemoryMapperService final
     : public ExecutorBootstrapService {
 public:
-  ~ExecutorSharedMemoryMapperService() override {};
+  ~ExecutorSharedMemoryMapperService() override = default;
 
   Expected<std::pair<ExecutorAddr, std::string>> reserve(uint64_t Size);
   Expected<ExecutorAddr> initialize(ExecutorAddr Reservation,

llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h

@@ -2383,7 +2383,7 @@ class OpenMPIRBuilder {
     /// runtime library for debugging
     Value *MapNamesArray = nullptr;
 
-    explicit TargetDataRTArgs() {}
+    explicit TargetDataRTArgs() = default;
     explicit TargetDataRTArgs(Value *BasePointersArray, Value *PointersArray,
                               Value *SizesArray, Value *MapTypesArray,
                               Value *MapTypesArrayEnd, Value *MappersArray,
@@ -2451,7 +2451,7 @@ class OpenMPIRBuilder {
     bool HasNoWait = false;
 
     // Constructors for TargetKernelArgs.
-    TargetKernelArgs() {}
+    TargetKernelArgs() = default;
     TargetKernelArgs(unsigned NumTargetItems, TargetDataRTArgs RTArgs,
                      Value *NumIterations, ArrayRef<Value *> NumTeams,
                      ArrayRef<Value *> NumThreads, Value *DynCGGroupMem,
@@ -2494,7 +2494,7 @@ class OpenMPIRBuilder {
     /// Whether the `target ... data` directive has a `nowait` clause.
     bool HasNoWait = false;
 
-    explicit TargetDataInfo() {}
+    explicit TargetDataInfo() = default;
     explicit TargetDataInfo(bool RequiresDevicePointerInfo,
                             bool SeparateBeginEndCalls)
         : RequiresDevicePointerInfo(RequiresDevicePointerInfo),

llvm/include/llvm/IR/DebugProgramInstruction.h

@@ -589,7 +589,7 @@ filterDbgVars(iterator_range<simple_ilist<DbgRecord>::iterator> R) {
 /// date.
 class DbgMarker {
 public:
-  DbgMarker() {}
+  DbgMarker() = default;
   /// Link back to the Instruction that owns this marker. Can be null during
   /// operations that move a marker from one instruction to another.
   Instruction *MarkedInstr = nullptr;

llvm/include/llvm/IR/DroppedVariableStats.h

@@ -42,7 +42,7 @@ class DroppedVariableStats {
 public:
   LLVM_ABI DroppedVariableStats(bool DroppedVarStatsEnabled);
 
-  virtual ~DroppedVariableStats() {}
+  virtual ~DroppedVariableStats() = default;
 
   // We intend this to be unique per-compilation, thus no copies.
   DroppedVariableStats(const DroppedVariableStats &) = delete;