Rollup merge of rust-lang#59093 - Zoxc:no-prealloc, r=michaelwoerister

Remove precompute_in_scope_traits_hashes

r? @michaelwoerister

Author: kennytm

src/librustc/ty/context.rs

@@ -1443,16 +1443,6 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
         }
     }
 
-    // This method exercises the `in_scope_traits_map` query for all possible
-    // values so that we have their fingerprints available in the DepGraph.
-    // This is only required as long as we still use the old dependency tracking
-    // which needs to have the fingerprints of all input nodes beforehand.
-    pub fn precompute_in_scope_traits_hashes(self) {
-        for &def_index in self.trait_map.keys() {
-            self.in_scope_traits_map(def_index);
-        }
-    }
-
     pub fn serialize_query_result_cache<E>(self,
                                            encoder: &mut E)
                                            -> Result<(), E::Error>

src/librustc_incremental/persist/load.rs

@@ -21,7 +21,6 @@ pub fn dep_graph_tcx_init<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     }
 
     tcx.allocate_metadata_dep_nodes();
-    tcx.precompute_in_scope_traits_hashes();
 }
 
 type WorkProductMap = FxHashMap<WorkProductId, WorkProduct>;