Add abilities to generate bitcode buffers from munged bitcode.

include/llvm/Bitcode/NaCl/NaClBitstreamWriter.h

 //===- NaClBitstreamWriter.h - NaCl bitstream writer ------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This header defines the BitstreamWriter class.  This class can be used to
@@ skipping 105 matching lines @@
     unsigned Offset = GetBufferOffset();
     assert((Offset & 3) == 0 && "Not 32-bit aligned");
     return Offset / 4;
   }
 
 public:
   explicit NaClBitstreamWriter(SmallVectorImpl<char> &O)
       : Out(O), CurBit(0), CurValue(0), CurCodeSize() {}
 
   ~NaClBitstreamWriter() {
-    assert(CurBit == 0 && "Unflused data remaining");
+    assert(CurBit == 0 && "Unflushed data remaining");
     assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
 
     // Free the BlockInfoRecords.
     while (!BlockInfoRecords.empty()) {
       BlockInfo &Info = BlockInfoRecords.back();
       // Free blockinfo abbrev info.
       for (unsigned i = 0, e = static_cast<unsigned>(Info.Abbrevs.size());
            i != e; ++i)
         Info.Abbrevs[i]->dropRef();
       BlockInfoRecords.pop_back();
@@ skipping 366 matching lines @@
     Info.Abbrevs.push_back(Abbv);
 
     return Info.Abbrevs.size()-1+naclbitc::FIRST_APPLICATION_ABBREV;
   }
 };
 
 
 } // End llvm namespace
 
 #endif