Add #[rustc_clean(loaded_from_disk)] to assert loading of query result

Currently, you can use `#[rustc_clean]` to assert to that a particular
query (technically, a `DepNode`) is green or red. However, a green
`DepNode` does not mean that the query result was actually deserialized
from disk - we might have never re-run a query that needed the result.

Some incremental tests are written as regression tests for ICEs that
occured during query result decoding. Using
`#[rustc_clean(loaded_from_disk="typeck")]`, you can now assert
that the result of a particular query (e.g. `typeck`) was actually
loaded from disk, in addition to being green.

compiler/rustc_query_system/src/query/plumbing.rs

@@ -519,6 +519,10 @@ where
         prof_timer.finish_with_query_invocation_id(dep_node_index.into());
 
         if let Some(result) = result {
+            if unlikely!(tcx.dep_context().sess().opts.debugging_opts.query_dep_graph) {
+                dep_graph.mark_debug_loaded_from_disk(*dep_node)
+            }
+
             let prev_fingerprint = tcx
                 .dep_context()
                 .dep_graph()