[Utils] Refactor update_cc_test_checks.py to use shutil

The package `distutils` is deprecated and removal is planned for Python 3.12. All calls to `distutils.spawn.find_executable` are replaced with local version of `find_executable` which makes use of `shutils.which`.

Reviewed By: arichardson, MaskRay

Differential Revision: https://reviews.llvm.org/D134015

Author: jmciver

llvm/utils/update_cc_test_checks.py

@@ -16,11 +16,11 @@
 
 import argparse
 import collections
-import distutils.spawn
 import json
 import os
 import re
 import shlex
+import shutil
 import subprocess
 import sys
 import tempfile
@@ -140,6 +140,14 @@ def infer_dependent_args(args):
       args.opt = os.path.join(args.llvm_bin, 'opt')
 
 
+def find_executable(executable):
+  _, ext = os.path.splitext(executable)
+  if sys.platform == 'win32' and ext != '.exe':
+    executable = executable + '.exe'
+
+  return shutil.which(executable)
+
+
 def config():
   parser = argparse.ArgumentParser(
       description=__doc__,
@@ -167,7 +175,7 @@ def config():
   args = common.parse_commandline_args(parser)
   infer_dependent_args(args)
 
-  if not distutils.spawn.find_executable(args.clang):
+  if not find_executable(args.clang):
     print('Please specify --llvm-bin or --clang', file=sys.stderr)
     sys.exit(1)
 
@@ -183,7 +191,7 @@ def config():
     common.warn('Could not determine clang builtins directory, some tests '
                 'might not update correctly.')
 
-  if not distutils.spawn.find_executable(args.opt):
+  if not find_executable(args.opt):
     # Many uses of this tool will not need an opt binary, because it's only
     # needed for updating a test that runs clang | opt | FileCheck. So we
     # defer this error message until we find that opt is actually needed.