Assertion in BASOP stereo encoder (bitrate switching, DTX on)
The stereo encoder crashes at frame 860 when using the following command-line parameters:
```
./IVAS_cod -dtx -max_band swb scripts/switchPaths/swb_low1.bin 32 stv48c_32_MONO.pcm bit
```
**Input File**:
[stv48c_32_MONO.pcm](/uploads/fe69f75d8aabca15cc80424b39062730/stv48c_32_MONO.pcm)
**Bitrate Switching Pattern**:
[swb_low1.bin](/uploads/0310e111dae9b92503be90b96e4cb00d/swb_low1.bin)
**Error Message**:
```
IVAS_cod: lib_com/basop32.c:834: shl: Assertion `0' failed.
Aborted (core dumped)
```
**Call Stack**:
```
shl(short var1, short var2) Line 792
ton_ene_est_fx(...) Line 2390
gethar_noisegn_fx(...) Line 836
EncodeSWBSubbands_fx(...) Line 942
swb_bwe_enc_lr_fx(...) Line 1292
hq_lr_enc_fx(...) Line 1065
hq_core_enc_fx(...) Line 273
evs_enc_fx(...) Line 332
IVAS_ENC_EncodeFrameToSerial(...) Line 1731
main(...) Line 709
```
issue