[Opus] Update to v1.2.1

third_party/opus/src/silk/init_decoder.c

 /***********************************************************************
 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 - Redistributions of source code must retain the above copyright notice,
 this list of conditions and the following disclaimer.
 - Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
@@ skipping 26 matching lines @@
 opus_int silk_init_decoder(
     silk_decoder_state          *psDec                          /* I/O  Decoder state pointer                       */
 )
 {
     /* Clear the entire encoder state, except anything copied */
     silk_memset( psDec, 0, sizeof( silk_decoder_state ) );
 
     /* Used to deactivate LSF interpolation */
     psDec->first_frame_after_reset = 1;
     psDec->prev_gain_Q16 = 65536;
+    psDec->arch = opus_select_arch();
 
     /* Reset CNG state */
     silk_CNG_Reset( psDec );
 
     /* Reset PLC state */
     silk_PLC_Reset( psDec );
 
     return(0);
 }