[NFC][clang] Fix static analyzer concerns

[Fznamznon]

Summary

HeaderIncludesCallback and HeaderIncludesJSONCallback classes may own
resources and free them in the destructor. However they don't have copy
user-written constructors/assignment operators, so an attempt to copy a
HeaderIncludesCallback object will use compiler-generated copy
constructor which will only do dummy copy and afterwards there will be
use-after-free issues.

[aaron.ballman]

LGTM!

[tahonermann]

This is a good change since the default copy constructor would do bad things when ownsOutputFile is true. The copy assignment operator is already implicitly deleted because of the presence of a data member of reference type, but I think it is helpful to explicitly delete both.

[Fznamznon]

Rebase to maybe fix precommit

clang/lib/Frontend/HeaderIncludeGen.cpp

HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_,
         OwnsOutputFile(OwnsOutputFile_), ShowAllHeaders(ShowAllHeaders_),
         ShowDepth(ShowDepth_), MSStyle(MSStyle_) {}
 
   ~HeaderIncludesCallback() override {
     if (OwnsOutputFile)
       delete OutputFile;
   }
 
+  HeaderIncludesCallback(const HeaderIncludesCallback &) = delete;
+  HeaderIncludesCallback &operator=(const HeaderIncludesCallback &) = delete;
+
   void FileChanged(SourceLocation Loc, FileChangeReason Reason,
                    SrcMgr::CharacteristicKind FileType,
                    FileID PrevFID) override;
 
   void FileSkipped(const FileEntryRef &SkippedFile, const Token &FilenameTok,
                    SrcMgr::CharacteristicKind FileType) override;
 
 private:
HeaderIncludesJSONCallback(const Preprocessor *PP, raw_ostream *OutputFile_,
       : SM(PP->getSourceManager()), OutputFile(OutputFile_),
         OwnsOutputFile(OwnsOutputFile_) {}
 
   ~HeaderIncludesJSONCallback() override {
     if (OwnsOutputFile)
       delete OutputFile;
   }
 
+  HeaderIncludesJSONCallback(const HeaderIncludesJSONCallback &) = delete;
+  HeaderIncludesJSONCallback &
+  operator=(const HeaderIncludesJSONCallback &) = delete;
+
   void EndOfMainFile() override;
 
   void FileChanged(SourceLocation Loc, FileChangeReason Reason,
                    SrcMgr::CharacteristicKind FileType,
                    FileID PrevFID) override;
 
   void FileSkipped(const FileEntryRef &SkippedFile, const Token &FilenameTok,
                    SrcMgr::CharacteristicKind FileType) override;