Add (unsupported experimental) feature allowing byte aligned bitcode.

lib/Bitcode/NaCl/Analysis/NaClBitcodeAnalyzer.cpp

 //===-- NaClBitcodeAnalyzer.cpp - Bitcode Analyzer ------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "nacl-bitcode-analyzer"
@@ skipping 390 matching lines @@
 int AnalyzeBitcodeInBuffer(const std::unique_ptr<MemoryBuffer> &Buf,
                            raw_ostream &OS,
                            const AnalysisDumpOptions &DumpOptions) {
   DEBUG(dbgs() << "-> AnalyzeBitcodeInBuffer\n");
 
   if (Buf->getBufferSize() & 3)
     return Error("Bitcode stream should be a multiple of 4 bytes in length");
 
   const unsigned char *BufPtr = (const unsigned char *)Buf->getBufferStart();
   const unsigned char *EndBufPtr = BufPtr + Buf->getBufferSize();
+  const unsigned char *HeaderPtr = BufPtr;
 
   NaClBitcodeHeader Header;
-  if (Header.Read(BufPtr, EndBufPtr))
+  if (Header.Read(HeaderPtr, EndBufPtr))
     return Error("Invalid PNaCl bitcode header");
 
   if (!Header.IsSupported())
     errs() << "Warning: " << Header.Unsupported() << "\n";
 
   if (!Header.IsReadable())
     Error("Bitcode file is not readable");
 
-  NaClBitstreamReader StreamFile(BufPtr, EndBufPtr);
+  NaClBitstreamReader StreamFile(BufPtr, EndBufPtr, Header);
   NaClBitstreamCursor Stream(StreamFile);
 
   unsigned NumTopBlocks = 0;
 
   // Print out header information.
   for (size_t i = 0, limit = Header.NumberFields(); i < limit; ++i) {
     OS << Header.GetField(i)->Contents() << "\n";
   }
   if (Header.NumberFields()) OS << "\n";
 
@@ skipping 27 matching lines @@
   ErrorOr<std::unique_ptr<MemoryBuffer>> ErrOrFile =
       MemoryBuffer::getFileOrSTDIN(InputFilename);
   if (std::error_code EC = ErrOrFile.getError())
     return Error(Twine("Error reading '") + InputFilename + "': " +
                  EC.message());
 
   return AnalyzeBitcodeInBuffer(ErrOrFile.get(), OS, DumpOptions);
 }
 
 } // namespace llvm