bpo-46417: Finalize structseq types at exit (GH-30645)

Add _PyStructSequence_FiniType() and _PyStaticType_Dealloc()
functions to finalize a structseq static type in Py_Finalize().
Currrently, these functions do nothing if Python is built in release
mode.

Clear static types:

* AsyncGenHooksType: sys.set_asyncgen_hooks()
* FlagsType: sys.flags
* FloatInfoType: sys.float_info
* Hash_InfoType: sys.hash_info
* Int_InfoType: sys.int_info
* ThreadInfoType: sys.thread_info
* UnraisableHookArgsType: sys.unraisablehook
* VersionInfoType: sys.version
* WindowsVersionType: sys.getwindowsversion()

1 files changed, 11 insertions, 0 deletions

diff --git a/Python/thread.c b/Python/thread.c
index b1c0cfe..c2457c4 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -243,3 +243,14 @@ PyThread_GetInfo(void)
     PyStructSequence_SET_ITEM(threadinfo, pos++, value);
     return threadinfo;
 }
+
+
+void
+_PyThread_FiniType(PyInterpreterState *interp)
+{
+    if (!_Py_IsMainInterpreter(interp)) {
+        return;
+    }
+
+    _PyStructSequence_FiniType(&ThreadInfoType);
+}