Deserialize ResolvedAsts and ResolutionImpacts only when needed for compilation.

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

 // Copyright (c) 2015, 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.
 
 library dart2js.call_structure;
 
 import '../common.dart';
 import '../common/names.dart' show Names;
 import '../elements/elements.dart';
 import '../tree/tree.dart';
@@ skipping 20 matching lines @@
 
   const CallStructure.unnamed(this.argumentCount);
 
   factory CallStructure(int argumentCount, [List<String> namedArguments]) {
     if (namedArguments == null || namedArguments.isEmpty) {
       return new CallStructure.unnamed(argumentCount);
     }
     return new NamedCallStructure(argumentCount, namedArguments);
   }
 
+  /// Creates the [CallStructure] corresponding to calling [signature] as
+  /// declared, that is, all named arguments are in the order of declaration.
+  factory CallStructure.fromSignature(FunctionSignature signature) {
+    List<String> namedParameters;
+    if (signature.optionalParametersAreNamed) {
+      namedParameters =
+          signature.optionalParameters.map((e) => e.name).toList();
+    }
+    return new CallStructure(signature.parameterCount, namedParameters);
+  }
+
   /// `true` if this call has named arguments.
   bool get isNamed => false;
 
   /// `true` if this call has no named arguments.
   bool get isUnnamed => true;
 
   /// The names of the named arguments in call-site order.
   List<String> get namedArguments => const <String>[];
 
   /// The names of the named arguments in canonicalized order.
@@ skipping 162 matching lines @@
     }
 
     /*T*/ internalCompileArgument(Node node) {
       return compileArgument(mapping[node]);
     }
 
     Link<Node> nodes = computeCallNodesFromParameters();
 
     // Synthesize a structure for the call.
     // TODO(ngeoffray): Should the resolver do it instead?
-    List<String> namedParameters;
-    if (signature.optionalParametersAreNamed) {
-      namedParameters =
-          signature.optionalParameters.map((e) => e.name).toList();
-    }
-    CallStructure callStructure =
-        new CallStructure(signature.parameterCount, namedParameters);
+    CallStructure callStructure = new CallStructure.fromSignature(signature);
     if (!callStructure.signatureApplies(signature)) {
       return false;
     }
     list.addAll(callStructure.makeArgumentsList(
         nodes, callee, internalCompileArgument, compileConstant));
 
     return true;
   }
 
   static bool sameNames(List<String> first, List<String> second) {
@@ skipping 35 matching lines @@
       return first.compareTo(second);
     });
     return _orderedNamedArguments;
   }
 
   @override
   String structureToString() {
     return 'arity=$argumentCount, named=[${namedArguments.join(', ')}]';
   }
 }