Use the entity model for dump_info.

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

 // Copyright (c) 2017, 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.
 
 part of world_builder;
 
 /// World builder specific to codegen.
 ///
 /// This adds additional access to liveness of selectors and elements.
 abstract class CodegenWorldBuilder implements WorldBuilder {
   /// Calls [f] with every instance field, together with its declarer, in an
   /// instance of [cls].
   void forEachInstanceField(covariant ClassEntity cls,
       void f(ClassEntity declarer, FieldEntity field));
 
   /// Calls [f] for each parameter of [function] providing the type and name of
   /// the parameter and the [defaultValue] if the parameter is optional.
   void forEachParameter(covariant FunctionEntity function,
       void f(DartType type, String name, ConstantValue defaultValue));
 
+  /// Calls [f] for each parameter - given as a [Local] - of [function].
+  void forEachParameterAsLocal(
+      covariant FunctionEntity function, void f(Local parameter));
+
   void forEachInvokedName(
       f(String name, Map<Selector, SelectorConstraints> selectors));
 
   void forEachInvokedGetter(
       f(String name, Map<Selector, SelectorConstraints> selectors));
 
   void forEachInvokedSetter(
       f(String name, Map<Selector, SelectorConstraints> selectors));
 
   /// Returns `true` if [field] has a constant initializer.
@@ skipping 546 matching lines @@
   /// instance of [cls].
   void forEachInstanceField(
       ClassElement cls, void f(ClassEntity declarer, FieldEntity field)) {
     cls.implementation
         .forEachInstanceField(f, includeSuperAndInjectedMembers: true);
   }
 
   @override
   void forEachParameter(MethodElement function,
       void f(DartType type, String name, ConstantValue defaultValue)) {
+    if (!function.hasFunctionSignature) return;
+    function = function.implementation;
     FunctionSignature parameters = function.functionSignature;
     parameters.orderedForEachParameter((_parameter) {
       ParameterElement parameter = _parameter;
       ConstantValue value;
       if (parameter.isOptional) {
         value = _constants.getConstantValue(parameter.constant);
       }
       f(parameter.type, parameter.name, value);
     });
   }
 
   @override
+  void forEachParameterAsLocal(
+      MethodElement function, void f(Local parameter)) {
+    if (!function.hasFunctionSignature) return;
+    function = function.implementation;
+    FunctionSignature parameters = function.functionSignature;
+    parameters.orderedForEachParameter((_parameter) {
+      ParameterElement parameter = _parameter;
+      f(parameter);
+    });
+  }
+
+  @override
   void _processInstantiatedClassMember(
       ClassEntity cls, MemberElement member, MemberUsedCallback memberUsed) {
     assert(member.isDeclaration, failedAt(member));
     if (member.isMalformed) return;
     super._processInstantiatedClassMember(cls, member, memberUsed);
   }
 
   @override
   _MemberUsage _getMemberUsage(
       MemberElement member, MemberUsedCallback memberUsed) {
@@ skipping 39 matching lines @@
     return _elementMap.getConstantFieldInitializer(field);
   }
 
   @override
   void forEachParameter(FunctionEntity function,
       void f(DartType type, String name, ConstantValue defaultValue)) {
     _elementMap.forEachParameter(function, f);
   }
 
   @override
+  void forEachParameterAsLocal(
+      FunctionEntity function, void f(Local parameter)) {
+    throw new UnimplementedError(
+        'KernelCodegenWorldBuilder.forEachParameterAsLocal');
+  }
+
+  @override
   void forEachInstanceField(
       ClassEntity cls, void f(ClassEntity declarer, FieldEntity field)) {
     _elementEnvironment.forEachClassMember(cls,
         (ClassEntity declarer, MemberEntity member) {
       if (member.isField && member.isInstanceMember) f(declarer, member);
     });
   }
 }