Fix occurrences of old fn names in comment and tracing

Author: spastorino

Diff for: compiler/rustc_trait_selection/src/traits/coherence.rs

@@ -998,7 +998,7 @@ impl<'a, 'tcx> ProofTreeVisitor<'tcx> for AmbiguityCausesVisitor<'a> {
 
         let Goal { param_env, predicate } = goal.goal();
 
-        // For bound predicates we simply call `infcx.replace_bound_vars_with_placeholders`
+        // For bound predicates we simply call `infcx.instantiate_binder_with_placeholders`
         // and then prove the resulting predicate as a nested goal.
         let trait_ref = match predicate.kind().no_bound_vars() {
             Some(ty::PredicateKind::Clause(ty::ClauseKind::Trait(tr))) => tr.trait_ref,

Diff for: compiler/rustc_ty_utils/src/instance.rs

@@ -61,7 +61,7 @@ fn resolve_instance<'tcx>(
 
         Ok(Some(Instance { def, args }))
     };
-    debug!("inner_resolve_instance: result={:?}", result);
+    debug!("resolve_instance: result={:?}", result);
     result
 }