fix problem with TypeVar bound to Model passed as a parameter

test-data/typecheck/models.test

@@ -8,7 +8,7 @@ reveal_type(User.objects.get())  # E: Revealed type is 'main.User*'
 [CASE test_leave_as_is_if_objects_is_set_and_fill_typevars_with_outer_class]
 from django.db import models
 
-class UserManager(models.Manager):
+class UserManager(models.Manager[User]):
     def get_or_404(self) -> User:
         pass
 
@@ -19,3 +19,31 @@ reveal_type(User.objects)  # E: Revealed type is 'main.UserManager'
 reveal_type(User.objects.get())  # E: Revealed type is 'main.User*'
 reveal_type(User.objects.get_or_404())  # E: Revealed type is 'main.User'
 
+[CASE test_model_objects_attribute_present_in_case_of_model_cls_passed_as_parameter]
+from typing import Type
+from django.db import models
+
+class Base:
+    def __init__(self, model_cls: Type[models.Model]):
+        self.model_cls = model_cls
+class MyModel(models.Model):
+    pass
+reveal_type(Base(MyModel).model_cls.objects)  # E: Revealed type is 'django.db.models.manager.Manager[django.db.models.base.Model]'
+
+[CASE test_model_objects_attribute_present_in_case_of_model_cls_passed_as_generic_parameter]
+from typing import TypeVar, Generic, Type
+from django.db import models
+
+_T = TypeVar('_T', bound=models.Model)
+class Base(Generic[_T]):
+    def __init__(self, model_cls: Type[_T]):
+        self.model_cls = model_cls
+        reveal_type(self.model_cls.objects)  # E: Revealed type is 'django.db.models.manager.Manager[django.db.models.base.Model]'
+class MyModel(models.Model):
+    pass
+base_instance = Base(MyModel)
+reveal_type(base_instance.model_cls.objects)  # E: Revealed type is 'django.db.models.manager.Manager[main.MyModel]'
+
+class Child(Base[MyModel]):
+    def method(self) -> None:
+        reveal_type(self.model_cls.objects)  # E: Revealed type is 'django.db.models.manager.Manager[main.MyModel]'