Correct error reporting bit for parallel PNaCl bitcode parses.

lib/Bitcode/NaCl/Reader/NaClBitstreamReader.cpp

 //===- NaClBitstreamReader.cpp --------------------------------------------===//
 //     NaClBitstreamReader implementation
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
@@ skipping 31 matching lines @@
 //===----------------------------------------------------------------------===//
 //  NaClBitstreamCursor implementation
 //===----------------------------------------------------------------------===//
 
 void NaClBitstreamCursor::ErrorHandler::
 Fatal(const std::string &ErrorMessage) const {
   // Default implementation is simply print message, and the bit where
   // the error occurred.
   std::string Buffer;
   raw_string_ostream StrBuf(Buffer);
-  naclbitc::ErrorAt(StrBuf, naclbitc::Fatal, getCurrentBitNo()) << ErrorMessage;
+  naclbitc::ErrorAt(StrBuf, naclbitc::Fatal,
+                    Cursor.getErrorBitNo(getCurrentBitNo())) << ErrorMessage;
   report_fatal_error(StrBuf.str());
 }
 
 void NaClBitstreamCursor::reportInvalidAbbrevNumber(unsigned AbbrevNo) const {
   std::string Buffer;
   raw_string_ostream StrBuf(Buffer);
   StrBuf << "Invalid abbreviation # " << AbbrevNo << " defined for record";
   ErrHandler->Fatal(StrBuf.str());
 }
 
@@ skipping 371 matching lines @@
         UpdateAbbrevs =
             &BitStream->getBlockInfo((unsigned)Record[0])->getAbbrevs();
         if (Listener) {
           Listener->Values = Record;
           Listener->SetBID();
         }
         break;
     }
   }
 }