Eagerly compute closure classes

pkg/compiler/lib/src/ssa/locals_handler.dart

 // Copyright (c) 2016, 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.
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../io/source_information.dart';
@@ skipping 168 matching lines @@
     }
     updateLocal(boxElement, newBox);
   }
 
   /// Documentation wanted -- johnniwinther
   ///
   /// Invariant: [function] must be an implementation element.
   void startFunction(AstElement element, ast.Node node) {
     assert(invariant(element, element.isImplementation));
     closureData = _compiler.closureToClassMapper
-        .computeClosureToClassMapping(element.resolvedAst);
+        .getClosureToClassMapping(element.resolvedAst);
 
     if (element is FunctionElement) {
       FunctionElement functionElement = element;
       FunctionSignature params = functionElement.functionSignature;
       ClosureScope scopeData = closureData.capturingScopes[node];
       params.orderedForEachParameter((ParameterElement parameterElement) {
         if (element.isGenerativeConstructorBody) {
           if (scopeData != null &&
               scopeData.isCapturedVariable(parameterElement)) {
             // The parameter will be a field in the box passed as the
@@ skipping 467 matching lines @@
   final ExecutableElement executableContext;
 
   // Avoid slow Object.hashCode.
   final int hashCode = _nextHashCode = (_nextHashCode + 1).toUnsigned(30);
   static int _nextHashCode = 0;
 
   SyntheticLocal(this.name, this.executableContext);
 
   toString() => 'SyntheticLocal($name)';
 }