bpo-39489: Remove COUNT_ALLOCS special build (GH-18259)

Remove:

* COUNT_ALLOCS macro
* sys.getcounts() function
* SHOW_ALLOC_COUNT code in listobject.c
* SHOW_TRACK_COUNT code in tupleobject.c
* PyConfig.show_alloc_count field
* -X showalloccount command line option
* @test.support.requires_type_collecting decorator

Lib/test/test_module.py

@@ -1,7 +1,7 @@
 # Test the module type
 import unittest
 import weakref
-from test.support import gc_collect, requires_type_collecting
+from test.support import gc_collect
 from test.support.script_helper import assert_python_ok
 
 import sys
@@ -101,7 +101,6 @@ class ModuleTests(unittest.TestCase):
         gc_collect()
         self.assertEqual(f().__dict__["bar"], 4)
 
-    @requires_type_collecting
     def test_clear_dict_in_ref_cycle(self):
         destroyed = []
         m = ModuleType("foo")
@@ -266,7 +265,6 @@ a = A(destroyed)"""
         self.assertEqual(r[-len(ends_with):], ends_with,
                          '{!r} does not end with {!r}'.format(r, ends_with))
 
-    @requires_type_collecting
     def test_module_finalization_at_shutdown(self):
         # Module globals and builtins should still be available during shutdown
         rc, out, err = assert_python_ok("-c", "from test import final_a")