Use the entity model for dump_info.

pkg/compiler/lib/src/universe/use.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This library defines individual world impacts.
 ///
 /// We call these building blocks `uses`. Each `use` is a single impact of the
 /// world. Some example uses are:
 ///
 ///  * an invocation of a top level function
@@ skipping 69 matching lines @@
   CLOSURE,
   CALL_METHOD,
   CONSTRUCTOR_INVOKE,
   CONST_CONSTRUCTOR_INVOKE,
   REDIRECTION,
   DIRECT_INVOKE,
   DIRECT_USE,
   INLINING,
 }
 
-/// Statically known use of an [Element].
+/// Statically known use of an [Entity].
 // TODO(johnniwinther): Create backend-specific implementations with better
 // invariants.
 class StaticUse {
   final Entity element;
   final StaticUseKind kind;
   final int hashCode;
   final DartType type;
 
   StaticUse.internal(Entity element, StaticUseKind kind, [DartType type = null])
       : this.element = element,
@@ skipping 430 matching lines @@
       : this._(value, ConstantUseKind.DIRECT);
 
   bool operator ==(other) {
     if (identical(this, other)) return true;
     if (other is! ConstantUse) return false;
     return value == other.value;
   }
 
   String toString() => 'ConstantUse(${value.toStructuredText()},$kind)';
 }