Install notion of diagnostic handler into PNaCl bitcode readers.

tools/llvm-dis/llvm-dis.cpp

Index: tools/llvm-dis/llvm-dis.cpp
diff --git a/tools/llvm-dis/llvm-dis.cpp b/tools/llvm-dis/llvm-dis.cpp
index dbf0c9c7b3c3440f4fddc91b550ebef9189ee1fd..86060e38a091b035e345209a17b333652a4412fe 100644
--- a/tools/llvm-dis/llvm-dis.cpp
+++ b/tools/llvm-dis/llvm-dis.cpp
@@ -188,9 +188,10 @@ int main(int argc, char **argv) {
         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;