Fix drop-tracking ICE when a struct containing a field with a `Drop` impl is used across an await

Previously, drop-tracking would incorrectly assume the struct would be dropped immediately, which
was not true: when the field had a type with a manual `Drop` impl, the drop becomes observable and
has to be dropped after the await instead.

For reasons I don't understand, this also fixes another error crater popped up related to type parameters.

 #98476

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