Auto merge of #140902 - azhogin:azhogin/async-drop-open-drop-for-adt-fix, r=oli-obk

Async drop fix for async_drop_in_place<T> layout for unspecified T

Fix for rust-lang/rust#140423.
Layout of `async_drop_in_place<T>::{closure}` is calculated for unspecified T from dataflow_const_prop `try_make_constant`.

`@oli-obk,` do you think, it may be a better solution to add check like `if !args[0].is_fully_specialized() { return None; }` in `fn async_drop_coroutine_layout`?
And could you, pls, recommend, how to implement `is_fully_specialized()` in a most simple way?

Author: bors