[cleanup] Refactor parser to use default members.

Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I56b730814539df7fdc2e1e5fb06c8b2b104b5fc8
Reviewed-on: https://chromium-review.googlesource.com/1223830
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55915}

src/parsing/duplicate-finder.h

@@ -22,7 +22,7 @@ class Scanner;
 // Scanner::IsDuplicateSymbol.
 class DuplicateFinder {
  public:
-  DuplicateFinder() {}
+  DuplicateFinder() = default;
 
  private:
   friend class Scanner;

src/parsing/parse-info.cc

@@ -99,7 +99,7 @@ ParseInfo::ParseInfo(Isolate* isolate, Handle<Script> script)
                            script->IsUserJavaScript());
 }
 
-ParseInfo::~ParseInfo() {}
+ParseInfo::~ParseInfo() = default;
 
 DeclarationScope* ParseInfo::scope() const { return literal()->scope(); }
 

src/parsing/preparsed-scope-data.h

@@ -190,7 +190,7 @@ class ConsumedPreParsedScopeData {
   static std::unique_ptr<ConsumedPreParsedScopeData> For(
       Zone* zone, ZonePreParsedScopeData* data);
 
-  virtual ~ConsumedPreParsedScopeData() {}
+  virtual ~ConsumedPreParsedScopeData() = default;
 
   virtual ProducedPreParsedScopeData* GetDataForSkippableFunction(
       Zone* zone, int start_position, int* end_position, int* num_parameters,
@@ -202,7 +202,7 @@ class ConsumedPreParsedScopeData {
   virtual void RestoreScopeAllocationData(DeclarationScope* scope) = 0;
 
  protected:
-  ConsumedPreParsedScopeData() {}
+  ConsumedPreParsedScopeData() = default;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ConsumedPreParsedScopeData);

src/parsing/scanner.h

@@ -38,7 +38,7 @@ class Utf16CharacterStream {
  public:
   static const uc32 kEndOfInput = -1;
 
-  virtual ~Utf16CharacterStream() {}
+  virtual ~Utf16CharacterStream() = default;
 
   inline uc32 Peek() {
     if (V8_LIKELY(buffer_cursor_ < buffer_end_)) {
@@ -194,7 +194,7 @@ class Scanner {
         : scanner_(scanner), bookmark_(kNoBookmark) {
       DCHECK_NOT_NULL(scanner_);
     }
-    ~BookmarkScope() {}
+    ~BookmarkScope() = default;
 
     void Set();
     void Apply();

test/cctest/parsing/test-scanner-streams.cc

@@ -40,7 +40,7 @@ class ChunkSource : public v8::ScriptCompiler::ExternalSourceStream {
     }
     chunks_.push_back({nullptr, 0});
   }
-  ~ChunkSource() {}
+  ~ChunkSource() = default;
   bool SetBookmark() override { return false; }
   void ResetToBookmark() override {}
   size_t GetMoreData(const uint8_t** src) override {