Compiler crash in pass beam_ssa_opt, sub pass ssa_opt_private_append (2)

[bjorng]

Describe the bug
The compiler crashes with the following output:

Sub pass ssa_opt_private_append
beam_ssa_private_append_crash2.erl: internal error in pass beam_ssa_opt:
exception error: no case clause matching {{bif,'not'},[{b_var,1}],self}
  in function  beam_ssa_private_append:track_value_in_fun/6 (beam_ssa_private_append.erl, line 192)
  in call from beam_ssa_private_append:private_append/3 (beam_ssa_private_append.erl, line 71)
  in call from compile:run_sub_passes_1/3 (compile.erl, line 424)
  in call from beam_ssa_opt:run_phases/3 (beam_ssa_opt.erl, line 75)
  in call from beam_ssa_opt:module/2 (beam_ssa_opt.erl, line 71)
  in call from compile:'-select_passes/2-anonymous-0-'/3 (compile.erl, line 683)
  in call from compile:fold_comp/4 (compile.erl, line 410)
  in call from compile:internal_comp/5 (compile.erl, line 394)

To Reproduce
Compile the following module:

-module(beam_ssa_private_append_crash2).
-compile([export_all]).

f(A) ->
    <<(case ok of
           A ->
               not is_alive();
           _  ->
               <<>>
       end)/bitstring>>.

Expected behavior
Compilation should succeed.

Affected versions
The current master branch.

Additional context
Same sub pass as #6847, but the crash is in another function.