Install notion of diagnostic handler into PNaCl bitcode readers.

tools/llvm-dis/llvm-dis.cpp

 //===-- llvm-dis.cpp - The low-level LLVM disassembler --------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This utility may be invoked in the following manner:
@@ skipping 170 matching lines @@
         // The Module's BitcodeReader's BitstreamReader takes ownership
         // of the StreamingMemoryObject.
         ErrorOr<std::unique_ptr<Module>> MOrErr =
             getStreamedBitcodeModule(DisplayFilename, Buffer.release(),
                                      Context);
         M = std::move(*MOrErr);
         M->materializeAllPermanently();
         break;
       }
       case PNaClFormat: {
+        DiagnosticHandlerFunction DiagnosticHandler = nullptr;
         M.reset(getNaClStreamedBitcodeModule(
-            DisplayFilename, Buffer.release(), Context, &errs(),
-            &ErrorMessage));
+            DisplayFilename, Buffer.release(), Context,
+            /* DiagnosticHandler = */ nullptr, &ErrorMessage));
         if(M.get()) {
           if (std::error_code EC = M->materializeAllPermanently()) {
             FoundErrors = true;
             ErrorMessage = EC.message();
             M.reset();
           }
         } else {
           FoundErrors = true;
         }
         break;
@@ skipping 44 matching lines @@
 
   // All that llvm-dis does is write the assembly to a file.
   if (!DontPrint)
     M->print(Out->os(), Annotator.get(), PreserveAssemblyUseListOrder);
 
   // Declare success.
   Out->keep();
 
   return 0;
 }