gh-144652: Support Windows exit status in support get_signal_name() (GH-144653)

Format Windows exit status as hexadecimal.
(cherry picked from commit b121dc4)

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: vstinner

Lib/test/support/__init__.py

@@ -3034,6 +3034,10 @@ def get_signal_name(exitcode):
     except KeyError:
         pass
 
+    # Format Windows exit status as hexadecimal
+    if 0xC0000000 <= exitcode:
+        return f"0x{exitcode:X}"
+
     return None
 
 class BrokenIter:

Lib/test/test_support.py

@@ -778,6 +778,7 @@ def test_get_signal_name(self):
             (128 + int(signal.SIGABRT), 'SIGABRT'),
             (3221225477, "STATUS_ACCESS_VIOLATION"),
             (0xC00000FD, "STATUS_STACK_OVERFLOW"),
+            (0xC0000906, "0xC0000906"),
         ):
             self.assertEqual(support.get_signal_name(exitcode), expected,
                              exitcode)