anchor.diff:  %% are repeated as required.
   repeated_passes(Opts) ->
       Ps = [?PASS(ssa_opt_live),
  +          ?PASS(ssa_opt_ne),
             ?PASS(ssa_opt_bs_puts),
             ?PASS(ssa_opt_dead),
             ?PASS(ssa_opt_cse),
  
positive.code:     {reverse(Acc),Count}.
  
  %%%
  %%% Merge blocks.
  %%%
  
  
negative.code: 
  -include("beam_ssa_opt.hrl").
  
  -import(lists, [all/2,append/1,duplicate/2,flatten/1,foldl/3,
                  keyfind/3,last/1,member/2,reverse/1,reverse/2,
                  splitwith/2,sort/1,takewhile/2,unzip/1]).
  
  -define(MAX_REPETITIONS, 16).
  
  