[include-cleaner] Print the line number of removal #includes.

[hokein]

Summary

I found that this information is helpful when using this tool.

clang-tools-extra/include-cleaner/tool/IncludeCleaner.cpp

void EndSourceFile() override {
     if (!Remove)
       Results.Unused.clear();
     std::string Final = fixIncludes(Results, Code, getStyle(Path));
 
     if (Print.getNumOccurrences()) {
       switch (Print) {
       case PrintStyle::Changes:
         for (const Include *I : Results.Unused)
-          llvm::outs() << "- " << I->quote() << "\n";
+          llvm::outs() << "- " << I->quote() << " @Line:" << I->Line << "\n";
         for (const auto &I : Results.Missing)
           llvm::outs() << "+ " << I << "\n";
         break;
       case PrintStyle::Final:
         llvm::outs() << Final;
         break;
       }
     }