First attempt to capture parser/translation errors in browser.

unittest/BitcodeMunge.cpp

 //===- BitcodeMunge.cpp - Subzero Bitcode Munger ----------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Test harness for testing malformed bitcode files in Subzero.
@@ skipping 20 matching lines @@
   Flags.setOutFileType(Ice::FT_Iasm);
   Flags.setTargetArch(Ice::Target_X8632);
   Flags.setVerbose(Ice::IceV_Instructions);
 }
 
 bool IceTest::SubzeroBitcodeMunger::runTest(const char *TestName,
                                             const uint64_t Munges[],
                                             size_t MungeSize) {
   const bool AddHeader = true;
   setupTest(TestName, Munges, MungeSize, AddHeader);
-  Ice::GlobalContext Ctx(DumpStream, DumpStream, nullptr, Flags);
+  Ice::GlobalContext Ctx(DumpStream, DumpStream, DumpStream, nullptr, Flags);
   Ice::PNaClTranslator Translator(&Ctx);
   Translator.translateBuffer(TestName, MungedInput.get());
 
   cleanupTest();
   return Translator.getErrorStatus().value() == 0;
 }
 
 } // end of namespace IceTest