Add abilities to generate bitcode buffers from munged bitcode.

include/llvm/Bitcode/NaCl/NaClBitcodeParser.h

 //===- NaClBitcodeParser.h -----------------------------------*- C++ -*-===//
 //     Low-level bitcode driver to parse PNaCl bitcode files.
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ skipping 439 matching lines @@
     Cursor.setErrorHandler(ErrHandler);
   }
 
   virtual ~NaClBitcodeParser();
 
   /// Reads the (top-level) block associated with the given block
   /// record at the stream cursor. Returns true if unable to parse.
   /// Can be called multiple times to parse multiple blocks.
   bool Parse();
 
+  /// Returns true if at end of buffer.
+  bool AtEndOfStream() const {
+    return Record.GetCursor().AtEndOfStream();
+  }
+
   // Called once the bitstream reader has entered the corresponding
   // subblock.  Argument NumWords is set to the number of words in the
   // corresponding subblock.
   virtual void EnterBlock(unsigned /*NumWords*/) {}
 
   // Called when the corresponding EndBlock of the block being parsed
   // is found.
   virtual void ExitBlock() {}
 
   // Called after each record (within the block) is read (into field Record).
@@ skipping 182 matching lines @@
   bool ParseBlockInternal();
 
   void operator=(const NaClBitcodeParser &Parser) LLVM_DELETED_FUNCTION;
   NaClBitcodeParser(const NaClBitcodeParser &Parser) LLVM_DELETED_FUNCTION;
 
 };
 
 }  // namespace llvm
 
 #endif