message: Add M1 Mac expected results for AudioDecoderIsacFixTest
  Cr-Commit-Position: refs/heads/master@{#34389}
diff: @@ -589,6 +589,8 @@ TEST_F(AudioDecoderIsacFixTest, EncodeDecode) {
  static const int kEncodedBytes = 685;
  #elif defined(WEBRTC_ARCH_ARM64)
  static const int kEncodedBytes = 673;
  +#elif defined(WEBRTC_MAC) && defined(WEBRTC_ARCH_ARM64) // M1 Mac
  + static const int kEncodedBytes = 673;
  #else
  static const int kEncodedBytes = 671;
  #endif
  