How to disable GDB backtrace new behavior of including disassembly in backtrace ?

How to disable GDB backtrace new behavior of including disassembly in
backtrace ?

I have built GDB 8.3 and here is an example of output that I now see:

bt
#0  0x0005ed42 in set_next_entity (se=<optimized out>,
cfs_rq=<optimized out>) at /linux/kernel/sched/fair.c:6844
   0x0005ed38 <pick_next_task_fair+492>:        80 74   li8 %7, 0x4 # 4
   0x0005ed3a <pick_next_task_fair+494>:        b8 70   add %7, %sp
   0x0005ed3c <pick_next_task_fair+496>:        ea 37   ld32 %3, %7
   0x0005ed3e <pick_next_task_fair+498>:        c7 13   cpy %1, %3
   0x0005ed40 <pick_next_task_fair+500>:        92 10   inc8 %1, 32 # 0x20
=> 0x0005ed42 <pick_next_task_fair+502>:        ea 11   ld32 %1, %1
   0x0005ed44 <pick_next_task_fair+504>:        ea 50   ld32 %5, %sp
   0x0005ed46 <pick_next_task_fair+506>:        e0 d0   gip %sr
   0x0005ed48 <pick_next_task_fair+508>:        a2 d0 4e 00 00 00
 inc32 %sr, 78 # 0x4e
   0x0005ed4e <pick_next_task_fair+514>:        d1 1d   jnz %1, %sr
#1  pick_next_task_fair (rq=<optimized out>, prev=<optimized out>,
rf=<optimized out>) at /linux/kernel/sched/fair.c:6844

Using an earlier version of GDB would have just shown two lines
without disassembly; ie:

bt
#0  0x0005ed42 in set_next_entity (se=<optimized out>,
cfs_rq=<optimized out>) at /linux/kernel/sched/fair.c:6844
#1  pick_next_task_fair (rq=<optimized out>, prev=<optimized out>,
rf=<optimized out>) at /linux/kernel/sched/fair.c:6844

How can I restore the GDB old behavior when using backtrace ?