Remove unused code from rustc_query_system

compiler/rustc_query_system/src/dep_graph/dep_node.rs

@@ -165,10 +165,6 @@ impl WorkProductId {
         cgu_name.hash(&mut hasher);
         WorkProductId { hash: hasher.finish() }
     }
-
-    pub fn from_fingerprint(fingerprint: Fingerprint) -> WorkProductId {
-        WorkProductId { hash: fingerprint }
-    }
 }
 
 impl<HCX> HashStable<HCX> for WorkProductId {

compiler/rustc_query_system/src/dep_graph/graph.rs

@@ -402,11 +402,6 @@ impl<K: DepKind> DepGraph<K> {
         self.data.as_ref().unwrap().previous.fingerprint_of(dep_node)
     }
 
-    #[inline]
-    pub fn prev_dep_node_index_of(&self, dep_node: &DepNode<K>) -> SerializedDepNodeIndex {
-        self.data.as_ref().unwrap().previous.node_to_index(dep_node)
-    }
-
     /// Checks whether a previous work product exists for `v` and, if
     /// so, return the path that leads to it. Used to skip doing work.
     pub fn previous_work_product(&self, v: &WorkProductId) -> Option<WorkProduct> {

compiler/rustc_query_system/src/dep_graph/query.rs

@@ -1,7 +1,5 @@
 use rustc_data_structures::fx::FxHashMap;
-use rustc_data_structures::graph::implementation::{
-    Direction, Graph, NodeIndex, INCOMING, OUTGOING,
-};
+use rustc_data_structures::graph::implementation::{Direction, Graph, NodeIndex, INCOMING};
 
 use super::{DepKind, DepNode};
 
@@ -52,23 +50,8 @@ impl<K: DepKind> DepGraphQuery<K> {
         }
     }
 
-    /// All nodes reachable from `node`. In other words, things that
-    /// will have to be recomputed if `node` changes.
-    pub fn transitive_successors(&self, node: &DepNode<K>) -> Vec<&DepNode<K>> {
-        self.reachable_nodes(node, OUTGOING)
-    }
-
     /// All nodes that can reach `node`.
     pub fn transitive_predecessors(&self, node: &DepNode<K>) -> Vec<&DepNode<K>> {
         self.reachable_nodes(node, INCOMING)
     }
-
-    /// Just the outgoing edges from `node`.
-    pub fn immediate_successors(&self, node: &DepNode<K>) -> Vec<&DepNode<K>> {
-        if let Some(&index) = self.indices.get(&node) {
-            self.graph.successor_nodes(index).map(|s| self.graph.node_data(s)).collect()
-        } else {
-            vec![]
-        }
-    }
 }