Re-enable WebRtcIsacfix_AllpassFilter2FixDec16Neon

webrtc/modules/audio_coding/codecs/isac/fix/source/isacfix.c

 /*
  *  Copyright (c) 2012 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 189 matching lines @@
  *
  * This function initializes function pointers for ARM Neon platform.
  */
 
 #if defined(WEBRTC_DETECT_NEON) || defined(WEBRTC_HAS_NEON)
 static void WebRtcIsacfix_InitNeon(void) {
   WebRtcIsacfix_AutocorrFix = WebRtcIsacfix_AutocorrNeon;
   WebRtcIsacfix_FilterMaLoopFix = WebRtcIsacfix_FilterMaLoopNeon;
   WebRtcIsacfix_Spec2Time = WebRtcIsacfix_Spec2TimeNeon;
   WebRtcIsacfix_Time2Spec = WebRtcIsacfix_Time2SpecNeon;
-// Disable AllpassFilter2FixDec16Neon function due to a clang bug.
-// Refer more details at:
-// https://code.google.com/p/webrtc/issues/detail?id=4567
-#if !defined(__clang__) || !defined(WEBRTC_ARCH_ARM64)
   WebRtcIsacfix_AllpassFilter2FixDec16 =
       WebRtcIsacfix_AllpassFilter2FixDec16Neon;
-#endif
   WebRtcIsacfix_MatrixProduct1 = WebRtcIsacfix_MatrixProduct1Neon;
   WebRtcIsacfix_MatrixProduct2 = WebRtcIsacfix_MatrixProduct2Neon;
 }
 #endif
 
 /****************************************************************************
  * WebRtcIsacfix_InitMIPS(...)
  *
  * This function initializes function pointers for MIPS platform.
  */
@@ skipping 1323 matching lines @@
   assert(inst->initflag & 1);  // Decoder initialized.
   WebRtcIsacfixBw_GetBandwidthInfo(&inst->bwestimator_obj, bwinfo);
 }
 
 void WebRtcIsacfix_SetBandwidthInfo(ISACFIX_MainStruct* ISAC_main_inst,
                                     const IsacBandwidthInfo* bwinfo) {
   ISACFIX_SubStruct* inst = (ISACFIX_SubStruct*)ISAC_main_inst;
   assert(inst->initflag & 2);  // Encoder initialized.
   WebRtcIsacfixBw_SetBandwidthInfo(&inst->bwestimator_obj, bwinfo);
 }