Install notion of diagnostic handler into PNaCl bitcode readers.

unittests/Bitcode/NaClParseTypesTest.cpp

 //===- llvm/unittest/Bitcode/NaClParseTypesTest.cpp ---------------------===//
 //     Tests parser for PNaCl bitcode.
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
@@ skipping 41 matching lines @@
   NaClParseBitcodeMunger Munger(ARRAY_TERM(BitcodeRecords));
   EXPECT_TRUE(Munger.runTest(true));
   EXPECT_EQ(
       "Successful parse!\n",
       Munger.getTestResults());
 
   // Show what happens when misdefining: @t1 = float"
   const uint64_t AddSelfReference[] = {
     ReplaceIndex, NaClMungedBitcode::Replace, 3, 3, 1, Terminator
   };
-  EXPECT_FALSE(Munger.runTest(ARRAY(AddSelfReference), false));
-  EXPECT_EQ(
-      "Error: Record doesn't have expected size or structure\n",
-      Munger.getTestResults());
-  EXPECT_FALSE(Munger.runTest(ARRAY(AddSelfReference), true));
-  EXPECT_EQ(
-      "Error(40:2): Invalid TYPE_CODE_FLOAT record\n"
-      "Error: Record doesn't have expected size or structure\n",
-      Munger.getTestResults());
+  EXPECT_FALSE(Munger.runTest(ARRAY(AddSelfReference)));
+  EXPECT_EQ("Invalid TYPE_CODE_FLOAT record\n"
+            "Corrupted bitcode\n",
+            stripErrorPrefix(Munger.getTestResults()));
 }
 
 } // end of namespace naclmungetest