[Analysis, CodeGen] Use "= default" (NFC) (llvm#166024)

Identified with modernize-use-equals-default.

Author: kazutakahirata

llvm/include/llvm/Analysis/AliasAnalysis.h

@@ -861,7 +861,7 @@ class AAResultBase {
 
   // Provide all the copy and move constructors so that derived types aren't
   // constrained.
-  AAResultBase(const AAResultBase &Arg) {}
+  AAResultBase(const AAResultBase &Arg) = default;
   AAResultBase(AAResultBase &&Arg) {}
 
 public:

llvm/include/llvm/Analysis/ConstraintSystem.h

@@ -64,7 +64,7 @@ class ConstraintSystem {
   SmallVector<std::string> getVarNamesList() const;
 
 public:
-  ConstraintSystem() {}
+  ConstraintSystem() = default;
   ConstraintSystem(ArrayRef<Value *> FunctionArgs) {
     NumVariables += FunctionArgs.size();
     for (auto *Arg : FunctionArgs) {

llvm/include/llvm/Analysis/DOTGraphTraitsPass.h

@@ -80,7 +80,7 @@ struct DOTGraphTraitsViewer
   /// virtual destructor needed. Making this dtor protected stops accidental
   /// invocation when the derived class destructor should have been called.
   /// Those derived classes sould be marked final to avoid the warning.
-  ~DOTGraphTraitsViewer() {}
+  ~DOTGraphTraitsViewer() = default;
 
 private:
   StringRef Name;
@@ -161,7 +161,7 @@ struct DOTGraphTraitsPrinter
   /// virtual destructor needed. Making this dtor protected stops accidental
   /// invocation when the derived class destructor should have been called.
   /// Those derived classes sould be marked final to avoid the warning.
-  ~DOTGraphTraitsPrinter() {}
+  ~DOTGraphTraitsPrinter() = default;
 
 private:
   StringRef Name;

llvm/include/llvm/CodeGen/BasicBlockSectionsProfileReader.h

@@ -66,7 +66,7 @@ class BasicBlockSectionsProfileReader {
   BasicBlockSectionsProfileReader(const MemoryBuffer *Buf)
       : MBuf(Buf), LineIt(*Buf, /*SkipBlanks=*/true, /*CommentMarker=*/'#'){};
 
-  BasicBlockSectionsProfileReader(){};
+  BasicBlockSectionsProfileReader() = default;
 
   // Returns true if basic block sections profile exist for function \p
   // FuncName.

llvm/include/llvm/CodeGen/MachineScheduler.h

@@ -829,7 +829,7 @@ class ResourceSegments {
 
 public:
   // constructor for empty set
-  explicit ResourceSegments(){};
+  explicit ResourceSegments() = default;
   bool empty() const { return _Intervals.empty(); }
   explicit ResourceSegments(const std::list<IntervalTy> &Intervals)
       : _Intervals(Intervals) {

llvm/include/llvm/CodeGen/WindowScheduler.h

@@ -105,7 +105,7 @@ class WindowScheduler {
 
 public:
   WindowScheduler(MachineSchedContext *C, MachineLoop &ML);
-  virtual ~WindowScheduler() {}
+  virtual ~WindowScheduler() = default;
 
   bool run();
 

llvm/lib/Analysis/AliasAnalysis.cpp

@@ -75,7 +75,7 @@ AAResults::AAResults(const TargetLibraryInfo &TLI) : TLI(TLI) {}
 AAResults::AAResults(AAResults &&Arg)
     : TLI(Arg.TLI), AAs(std::move(Arg.AAs)), AADeps(std::move(Arg.AADeps)) {}
 
-AAResults::~AAResults() {}
+AAResults::~AAResults() = default;
 
 bool AAResults::invalidate(Function &F, const PreservedAnalyses &PA,
                            FunctionAnalysisManager::Invalidator &Inv) {

llvm/lib/CodeGen/CodeGenPrepare.cpp

@@ -368,7 +368,7 @@ class CodeGenPrepare {
   std::unique_ptr<DominatorTree> DT;
 
 public:
-  CodeGenPrepare(){};
+  CodeGenPrepare() = default;
   CodeGenPrepare(const TargetMachine *TM) : TM(TM){};
   /// If encounter huge function, we need to limit the build time.
   bool IsHugeFunc = false;

llvm/lib/CodeGen/MachineScheduler.cpp

@@ -334,7 +334,7 @@ class MachineSchedulerImpl : public MachineSchedulerBase {
     LiveIntervals &LIS;
   };
 
-  MachineSchedulerImpl() {}
+  MachineSchedulerImpl() = default;
   // Migration only
   void setLegacyPass(MachineFunctionPass *P) { this->P = P; }
   void setMFAM(MachineFunctionAnalysisManager *MFAM) { this->MFAM = MFAM; }
@@ -358,7 +358,7 @@ class PostMachineSchedulerImpl : public MachineSchedulerBase {
     MachineLoopInfo &MLI;
     AAResults &AA;
   };
-  PostMachineSchedulerImpl() {}
+  PostMachineSchedulerImpl() = default;
   // Migration only
   void setLegacyPass(MachineFunctionPass *P) { this->P = P; }
   void setMFAM(MachineFunctionAnalysisManager *MFAM) { this->MFAM = MFAM; }

llvm/lib/CodeGen/RegAllocFast.cpp

@@ -206,7 +206,7 @@ class RegAllocFastImpl {
     bool Error = false;              ///< Could not allocate.
 
     explicit LiveReg(Register VirtReg) : VirtReg(VirtReg) {}
-    explicit LiveReg() {}
+    explicit LiveReg() = default;
 
     unsigned getSparseSetIndex() const { return VirtReg.virtRegIndex(); }
   };