Move importlib.test.benchmark to Tools/importbench to make it more

visible and to place it with other micro-benchmarks (e.g.
stringbench).

Misc/NEWS

@@ -154,6 +154,8 @@ Extension Modules
 Tools/Demos
 -----------
 
+- Move importlib.test.benchmark to Tools/importbench.
+
 - Issue #12605: The gdb hooks for debugging CPython (within Tools/gdb) have
   been enhanced to show information on more C frames relevant to CPython within
   the "py-bt" and "py-bt-full" commands:

Tools/importbench/README

@@ -0,0 +1,6 @@
+Importbench is a set of micro-benchmarks for various import scenarios.
+
+It should not be used as an overall benchmark of import performance, but rather
+an easy way to measure impact of possible code changes. For a real-world
+benchmark of import, use the normal_startup benchmark from
+hg.python.org/benchmarks.

Tools/importbench/importbench.py

@@ -4,8 +4,8 @@ The assumption is made that this benchmark is run in a fresh interpreter and
 thus has no external changes made to import-related attributes in sys.
 
 """
-from . import util
-from .source import util as source_util
+from test.test_importlib import util
+from test.test_importlib.source import util as source_util
 import decimal
 import imp
 import importlib