Remove redundant Span in QueryJobInfo

Previously, `QueryJobInfo` was composed of two parts: a `QueryInfo` and
a `QueryJob`. However, both `QueryInfo` and `QueryJob` have a `span`
field, which seem to be the same. So, the `span` was recorded twice.

Now, `QueryJobInfo` is composed of a `QueryStackFrame` (the other field
of `QueryInfo`) and a `QueryJob`. So, now, the `span` is only recorded
once.

compiler/rustc_query_system/src/query/job.rs

@@ -61,7 +61,7 @@ where
     }
 
     fn query(self, map: &QueryMap<D>) -> QueryStackFrame {
-        map.get(&self).unwrap().info.query.clone()
+        map.get(&self).unwrap().query.clone()
     }
 
     #[cfg(parallel_compiler)]
@@ -81,7 +81,7 @@ where
 }
 
 pub struct QueryJobInfo<D> {
-    pub info: QueryInfo,
+    pub query: QueryStackFrame,
     pub job: QueryJob<D>,
 }
 
@@ -155,7 +155,7 @@ where
 
         while let Some(job) = current_job {
             let info = query_map.get(&job).unwrap();
-            cycle.push(info.info.clone());
+            cycle.push(QueryInfo { span: info.job.span, query: info.query.clone() });
 
             if job == *self {
                 cycle.reverse();
@@ -170,7 +170,7 @@ where
                     .job
                     .parent
                     .as_ref()
-                    .map(|parent| (info.info.span, parent.query(&query_map)));
+                    .map(|parent| (info.job.span, parent.query(&query_map)));
                 return CycleError { usage, cycle };
             }
 
@@ -649,13 +649,10 @@ pub fn print_query_stack<CTX: QueryContext>(
         };
         let mut diag = Diagnostic::new(
             Level::FailureNote,
-            &format!(
-                "#{} [{}] {}",
-                i, query_info.info.query.name, query_info.info.query.description
-            ),
+            &format!("#{} [{}] {}", i, query_info.query.name, query_info.query.description),
         );
         diag.span =
-            tcx.dep_context().sess().source_map().guess_head_span(query_info.info.span).into();
+            tcx.dep_context().sess().source_map().guess_head_span(query_info.job.span).into();
         handler.force_print_diagnostic(diag);
 
         current_query = query_info.job.parent;

compiler/rustc_query_system/src/query/plumbing.rs

@@ -130,8 +130,8 @@ where
             for (k, v) in shard.active.iter() {
                 if let QueryResult::Started(ref job) = *v {
                     let id = QueryJobId::new(job.id, shard_id, kind);
-                    let info = QueryInfo { span: job.span, query: make_query(tcx, k.clone()) };
-                    jobs.insert(id, QueryJobInfo { info, job: job.clone() });
+                    let query = make_query(tcx, k.clone());
+                    jobs.insert(id, QueryJobInfo { query, job: job.clone() });
                 }
             }
         }