[include-cleaner] Include the reference type when printing the SymbolReference.

[hokein]

Summary

This information is useful when printing the reference for debugging
purposes.

[kadircet]

clang-tools-extra/include-cleaner/lib/Types.cpp

49

i think this might read better as:

OS << R.RT << " reference to " << R.Target << "@0x" << ...;

clang-tools-extra/include-cleaner/lib/Types.cpp

 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Include &I) {
   return OS << I.Line << ": " << I.quote() << " => "
             << (I.Resolved ? I.Resolved->getName() : "<missing>");
 }
 
 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const SymbolReference &R) {
   // We can't decode the Location without SourceManager. Its raw representation
   // isn't completely useless (and distinguishes SymbolReference from Symbol).
-  return OS << R.Target << "@0x"
+  return OS << R.RT << " reference to " << R.Target << "@0x"
             << llvm::utohexstr(
                    R.RefLocation.getRawEncoding(), /*LowerCase=*/false,
                    /*Width=*/CHAR_BIT * sizeof(SourceLocation::UIntTy));
 }
 
 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, RefType T) {
   switch (T) {
   case RefType::Explicit: