Auto merge of #113902 - Enselic:lint-recursive-drop, r=oli-obk

Make `unconditional_recursion` warning detect recursive drops

Closes #55388

Also closes #50049 unless we want to keep it for the second example which this PR does not solve, but I think it is better to track that work in #57965.

r? `@oli-obk` since you are the mentor for #55388

Unresolved questions:
- [x] There are two false positives that must be fixed before merging (see diff). I suspect the best way to solve them is to perform analysis after drop elaboration instead of before, as now, but I have not explored that any further yet. Could that be an option? **Answer:** Yes, that solved the problem.

`@rustbot` label +T-compiler +C-enhancement +A-lint

compiler/rustc_mir_transform/src/lib.rs

@@ -424,6 +424,10 @@ fn mir_drops_elaborated_and_const_checked(tcx: TyCtxt<'_>, def: LocalDefId) -> &
 
     run_analysis_to_runtime_passes(tcx, &mut body);
 
+    // Now that drop elaboration has been performed, we can check for
+    // unconditional drop recursion.
+    rustc_mir_build::lints::check_drop_recursion(tcx, &body);
+
     tcx.alloc_steal_mir(body)
 }