Additional clean ups on errors in bitcode parsing.

lib/Bitcode/NaCl/Reader/NaClBitcodeReader.cpp

Index: lib/Bitcode/NaCl/Reader/NaClBitcodeReader.cpp
diff --git a/lib/Bitcode/NaCl/Reader/NaClBitcodeReader.cpp b/lib/Bitcode/NaCl/Reader/NaClBitcodeReader.cpp
index c1fb4a84aa1e43f69db9317cd7a38470143cc4c1..fca2ee760e09af1c50b2356626c1931c8b8e191b 100644
--- a/lib/Bitcode/NaCl/Reader/NaClBitcodeReader.cpp
+++ b/lib/Bitcode/NaCl/Reader/NaClBitcodeReader.cpp
@@ -192,10 +192,8 @@ static_assert(
 std::error_code NaClBitcodeReader::Error(ErrorType E,
                                          const std::string &Message) const {
   if (Verbose) {
-    uint64_t Bit = Stream.GetCurrentBitNo();
-    *Verbose << "Error: (" <<  (Bit / CHAR_BIT) << ":"
-             << static_cast<unsigned>(Bit % CHAR_BIT)
-             << ") " << Message << "\n";
+    naclbitc::ErrorAt(*Verbose, naclbitc::Error, Stream.GetCurrentBitNo())
+        << Message << "\n";
   }
   return Error(E);
 }