Fix scoping key

The previous logic would add the size of the pointer target to the pointer value, which might point to another pointer being used as a scope key. Now, we increment the value as an integer instead, which means it can never be a valid pointer.

Python/compile.c

@@ -2180,7 +2180,7 @@ compiler_type_params(struct compiler *c, asdl_type_param_seq *type_params)
                 seen_default = true;
                 expr_ty default_ = typeparam->v.TypeVar.default_value;
                 if (compiler_type_param_bound_or_default(c, default_, typeparam->v.TypeVar.name,
-                                                         (void *)(typeparam + 1), false) < 0) {
+                                                         (void *)((uintptr_t)typeparam + 1), false) < 0) {
                     return ERROR;
                 }
                 ADDOP_I(c, loc, CALL_INTRINSIC_2, INTRINSIC_SET_TYPEPARAM_DEFAULT);

Python/symtable.c

@@ -2317,7 +2317,7 @@ symtable_visit_type_param(struct symtable *st, type_param_ty tp)
             VISIT_QUIT(st, 0);
         }
         if (!symtable_visit_type_param_bound_or_default(st, tp->v.TypeVar.default_value, tp->v.TypeVar.name,
-                                                        (void *)(tp + 1))) {
+                                                        (void *)((uintptr_t)tp + 1))) {
             VISIT_QUIT(st, 0);
         }
         break;