Rollup merge of #129847 - compiler-errors:async-cycle, r=davidtwco

Do not call query to compute coroutine layout for synthetic body of async closure

There is code in the MIR validator that attempts to prevent query cycles when inlining a coroutine into itself, and will use the coroutine layout directly from the body when it detects that's the same coroutine as the one that's being validated. After #128506, this logic didn't take into account the fact that the coroutine def id will differ if it's the "by-move body" of an async closure. This PR implements that.

Fixes #129811

Author: matthiaskrgr