Encoder crash for Stereo at 16.4kbps in prep_tbe_exc_fx()

Basic info

• Fixed point:
  • Encoder (fixed): 8cdb71cc

Bug description

The fixed point encoder crashes with an assert:

Assertion failed: (0), function L_shl, file basop32.c, line 2332.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1804

./IVAS_cod -stereo -max_band WB 16400 32 dm1aa1s08_32.10dB.wav bit