Fix UBSan errors (left shift of negative value, left shift overflows int)

webrtc/modules/audio_coding/codecs/isac/main/source/arith_routines_hist.c

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 196 matching lines @@
 
   stream_ptr = streamdata->stream + streamdata->stream_index;
   W_upper = streamdata->W_upper;
   if (W_upper == 0)
     /* Should not be possible in normal operation */
     return -2;
 
   if (streamdata->stream_index == 0)   /* first time decoder is called for this stream */
   {
     /* read first word from bytestream */
-    streamval = *stream_ptr << 24;
-    streamval |= *++stream_ptr << 16;
-    streamval |= *++stream_ptr << 8;
-    streamval |= *++stream_ptr;
+    streamval = (uint32_t)(*stream_ptr) << 24;
+    streamval |= (uint32_t)(*++stream_ptr) << 16;
+    streamval |= (uint32_t)(*++stream_ptr) << 8;
+    streamval |= (uint32_t)(*++stream_ptr);
   } else {
     streamval = streamdata->streamval;
   }
 
 
   for (k=N; k>0; k--)
   {
     /* find the integer *data for which streamval lies in [W_lower+1, W_upper] */
     W_upper_LSB = W_upper & 0x0000FFFF;
     W_upper_MSB = W_upper >> 16;
@@ skipping 51 matching lines @@
   streamdata->W_upper = W_upper;
   streamdata->streamval = streamval;
 
 
   /* find number of bytes in original stream (determined by current interval width) */
   if ( W_upper > 0x01FFFFFF )
     return streamdata->stream_index - 2;
   else
     return streamdata->stream_index - 1;
 }