[llvm-objcopy] Remove unneeded checks. NFC

[grimar]

LGTM

[jhenderson]

LGTM, personally, but I know @jakehehrlich had some thoughts on this, so I'd like him to give a thumbs up on it before this lands. See for example comments on D49979.

tools/llvm-objcopy/ELF/ELFObjcopy.cpp

if (!Config.SetSectionFlags.empty()) {
     for (auto &Sec : Obj.sections()) {
       const auto Iter = Config.SetSectionFlags.find(Sec.Name);
       if (Iter != Config.SetSectionFlags.end()) {
         const SectionFlagsUpdate &SFU = Iter->second;
         Sec.Flags = setSectionFlagsPreserveMask(Sec.Flags, SFU.NewFlags);
       }
     }
   }
   
-  if (!Config.AddSection.empty()) {
-    for (const auto &Flag : Config.AddSection) {
-      std::pair<StringRef, StringRef> SecPair = Flag.split("=");
-      StringRef SecName = SecPair.first;
-      StringRef File = SecPair.second;
-      ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
-          MemoryBuffer::getFile(File);
-      if (!BufOrErr)
-        return createFileError(File, errorCodeToError(BufOrErr.getError()));
-      std::unique_ptr<MemoryBuffer> Buf = std::move(*BufOrErr);
-      ArrayRef<uint8_t> Data(
-          reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
-          Buf->getBufferSize());
-      OwnedDataSection &NewSection =
-          Obj.addSection<OwnedDataSection>(SecName, Data);
-      if (SecName.startswith(".note") && SecName != ".note.GNU-stack")
-        NewSection.Type = SHT_NOTE;
-    }
-  }
 
-  if (!Config.DumpSection.empty()) {
-    for (const auto &Flag : Config.DumpSection) {
-      std::pair<StringRef, StringRef> SecPair = Flag.split("=");
-      StringRef SecName = SecPair.first;
-      StringRef File = SecPair.second;
-      if (Error E = dumpSectionToFile(SecName, File, Obj))
-        return createFileError(Config.InputFilename, std::move(E));
-    }
-  }
 
   if (!Config.AddGnuDebugLink.empty())
     Obj.addSection<GnuDebugLinkSection>(Config.AddGnuDebugLink);
 
   for (const NewSymbolInfo &SI : Config.SymbolsToAdd) {
     SectionBase *Sec = Obj.findSection(SI.SectionName);
     uint64_t Value = Sec ? Sec->Addr + SI.Value : SI.Value;
     Obj.SymbolTable->addSymbol(