Perform return type inference and application across local calls (#13984)

lib/elixir/src/elixir_compiler.erl

@@ -144,7 +144,6 @@ bootstrap() ->
   elixir_config:static(#{bootstrap => true}),
   elixir_config:put(docs, false),
   elixir_config:put(ignore_module_conflict, true),
-  elixir_config:put(infer_signatures, false),
   elixir_config:put(on_undefined_variable, raise),
   elixir_config:put(parser_options, []),
   elixir_config:put(relative_paths, false),
@@ -191,13 +190,13 @@ bootstrap_files() ->
     [
      <<"list/chars.ex">>,
      <<"bitwise.ex">>,
-     <<"module/locals_tracker.ex">>,
      <<"module/parallel_checker.ex">>,
      <<"module/behaviour.ex">>,
      <<"module/types/helpers.ex">>,
      <<"module/types/descr.ex">>,
      <<"module/types/of.ex">>,
      <<"module/types/pattern.ex">>,
+     <<"module/types/apply.ex">>,
      <<"module/types/expr.ex">>,
      <<"module/types.ex">>,
      <<"exception.ex">>,