Fix UBSan errors (left shift of negative value)

webrtc/modules/audio_coding/codecs/isac/fix/source/decode.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 164 matching lines @@
     }
 
 
     /* reduce gain to compensate for pitch enhancer */
     /* gain = 1.0f - 0.45f * AvgPitchGain; */
     tmp32a = AvgPitchGain_Q12 * 29;  // Q18
     gainQ13 = (int16_t)((262144 - tmp32a) >> 5);  // Q18 -> Q13.
 
     for (k = 0; k < FRAMESAMPLES/2; k++)
     {
-      Vector_Word32_1[k] = (Vector_Word16_2[k] * gainQ13) << 3;  // Q25
+      Vector_Word32_1[k] = (Vector_Word16_2[k] * gainQ13) * (1 << 3);  // Q25
     }
 
 
     /* perceptual post-filtering (using normalized lattice filter) */
     WebRtcIsacfix_NormLatticeFilterAr(ORDERLO, (ISACdec_obj->maskfiltstr_obj).PostStateLoGQ0,
                                       Vector_Word32_1, lofilt_coefQ15, gain_lo_hiQ17, 0, Vector_Word16_1);
 
     /* --- Store Highpass Residual --- */
     for (k = 0; k < FRAMESAMPLES/2; k++)
-      Vector_Word32_1[k] = Vector_Word32_2[k] << 9;  // Q16 -> Q25
+      Vector_Word32_1[k] = Vector_Word32_2[k] * (1 << 9);  // Q16 -> Q25
 
     for( k = 0; k < PITCH_MAX_LAG + 10; k++ )
       (ISACdec_obj->plcstr_obj).prevHP[k] = Vector_Word32_1[FRAMESAMPLES/2 - (PITCH_MAX_LAG + 10) + k];
 
 
     WebRtcIsacfix_NormLatticeFilterAr(ORDERHI, (ISACdec_obj->maskfiltstr_obj).PostStateHiGQ0,
                                       Vector_Word32_1, hifilt_coefQ15, gain_lo_hiQ17, 1, Vector_Word16_2);
 
     /* recombine the 2 bands */
 
     /* Form the polyphase signals, and compensate for DC offset */
     for (k=0;k<FRAMESAMPLES/2;k++) {
       tmp_1 = (int16_t)WebRtcSpl_SatW32ToW16(((int32_t)Vector_Word16_1[k]+Vector_Word16_2[k] + 1)); /* Construct a new upper channel signal*/
       tmp_2 = (int16_t)WebRtcSpl_SatW32ToW16(((int32_t)Vector_Word16_1[k]-Vector_Word16_2[k])); /* Construct a new lower channel signal*/
       Vector_Word16_1[k] = tmp_1;
       Vector_Word16_2[k] = tmp_2;
     }
 
     WebRtcIsacfix_FilterAndCombine1(Vector_Word16_1,
                                     Vector_Word16_2,
                                     signal_out16 + frame_nb * kProcessedSamples,
                                     &ISACdec_obj->postfiltbankstr_obj);
 
   }
   return len;
 }