Move private function _args_from_interpreter_flags() to subprocess.py, so

that it can be imported when threads are disabled.
(followup to issue #12098)

Lib/multiprocessing/util.py

@@ -14,6 +14,7 @@ import weakref
 import atexit
 import threading        # we want threading to install it's
                         # cleanup function before multiprocessing does
+from subprocess import _args_from_interpreter_flags
 
 from multiprocessing.process import current_process, active_children
 
@@ -297,32 +298,3 @@ class ForkAwareLocal(threading.local):
     def __reduce__(self):
         return type(self), ()
 
-#
-# Get options for python to produce the same sys.flags
-#
-
-def _args_from_interpreter_flags():
-    """Return a list of command-line arguments reproducing the current
-    settings in sys.flags and sys.warnoptions."""
-    flag_opt_map = {
-        'debug': 'd',
-        # 'inspect': 'i',
-        # 'interactive': 'i',
-        'optimize': 'O',
-        'dont_write_bytecode': 'B',
-        'no_user_site': 's',
-        'no_site': 'S',
-        'ignore_environment': 'E',
-        'verbose': 'v',
-        'bytes_warning': 'b',
-        'quiet': 'q',
-        'hash_randomization': 'R',
-    }
-    args = []
-    for flag, opt in flag_opt_map.items():
-        v = getattr(sys.flags, flag)
-        if v > 0:
-            args.append('-' + opt * v)
-    for opt in sys.warnoptions:
-        args.append('-W' + opt)
-    return args