Fix bootstrap issues

lib/elixir/src/elixir_code_server.erl

@@ -30,12 +30,8 @@ start_link() ->
 
 init(ok) ->
   %% We attempt to load those modules here so throughout
-  %% the codebase we can use a code:is_loaded/1 check on
-  %% bootstrap instead of using the more expensive
-  %% code:ensure_loaded/1 multiple times.
+  %% the codebase we can avoid code:is_loaded/1 checks.
   _ = code:ensure_loaded('Elixir.Macro.Env'),
-  _ = code:ensure_loaded('Elixir.Module.LocalsTracker'),
-  _ = code:ensure_loaded('Elixir.Kernel.LexicalTracker'),
 
   %% The table where we store module definitions
   _ = ets:new(elixir_modules, [set, protected, named_table, {read_concurrency, true}]),