am 69aae36e: Merge "stagefright aacenc: Safeguard against overwriting bits"

  wBitPos = hBitBuf->wBitPos;

  wBitPos += noBitsToWrite;

  writeValue &= ~(0xffffffff << noBitsToWrite); // Mask out everything except the lowest noBitsToWrite bits

  writeValue <<= 32 - wBitPos;

  writeValue |= hBitBuf->cache;