Fix the NaCl bitstream reader to report fatal errors.

include/llvm/Bitcode/NaCl/NaClObjDumpStream.h

Index: include/llvm/Bitcode/NaCl/NaClObjDumpStream.h
diff --git a/include/llvm/Bitcode/NaCl/NaClObjDumpStream.h b/include/llvm/Bitcode/NaCl/NaClObjDumpStream.h
index f75a6c7f9394ee250b84b7844adf211cf492a215..ddf0cfbfb3d9458a8e1193ed3b083c39ce2ccce1 100644
--- a/include/llvm/Bitcode/NaCl/NaClObjDumpStream.h
+++ b/include/llvm/Bitcode/NaCl/NaClObjDumpStream.h
@@ -844,6 +844,7 @@ public:
   /// Write a fatal error message to the dump stream, and then
   /// stop the executable. If any assembly, comments, or errors have
   /// been buffered, they will be printed first.
+  LLVM_ATTRIBUTE_NORETURN
   void Fatal(const std::string &Message) {
     Fatal(LastKnownBit, Message);
   }
@@ -852,11 +853,13 @@ public:
   /// stop the executable. If any assembly, comments, or errors have
   /// been buffered, they will be printed first. Associates fatal error
   /// Message with the given Bit.
+  LLVM_ATTRIBUTE_NORETURN
   void Fatal(uint64_t Bit, const std::string &Message);
 
   /// Write a fatal error message to the dump stream, and then
   /// stop the executable. If any assembly, comments, or errors have
   /// been buffered, they will be printed first, along with the given record.
+  LLVM_ATTRIBUTE_NORETURN
   void Fatal(uint64_t Bit,
              const llvm::NaClBitcodeRecordData &Record,
              const std::string &Message);