Insert default arguments for static calls and constructor calls.

pkg/compiler/lib/src/ssa/kernel_ast_adapter.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 'package:js_runtime/shared/embedded_names.dart';
 import 'package:kernel/ast.dart' as ir;
 
 import '../constants/expressions.dart';
 import '../common.dart';
 import '../common/names.dart';
@@ skipping 274 matching lines @@
   }
 
   ConstantValue getConstantFor(ir.Node node) {
     ConstantValue constantValue =
         _backend.constants.getConstantValueForNode(getNode(node), elements);
     assert(invariant(getNode(node), constantValue != null,
         message: 'No constant computed for $node'));
     return constantValue;
   }
 
+  ConstantValue getConstantForParameterDefaultValue(ir.Node defaultExpression) {
+    // TODO(27394): Evaluate constant expressions in ir.Node domain.
+    // In the interim, expand the Constantifier and do this:
+    //
+    //     ConstantExpression constantExpression =
+    //         defaultExpression.accept(new Constantifier(this));
+    //     assert(constantExpression != null);
+    ConstantExpression constantExpression =
+        kernel.parameterInitializerNodeToConstant[defaultExpression];
+    if (constantExpression == null) return null;
+    return _backend.constants.getConstantValue(constantExpression);
+  }
+
   ConstantValue getConstantForType(ir.DartType irType) {
     DartType type = getDartType(irType);
     return _backend.constantSystem.createType(_compiler, type.asRaw());
   }
 
   bool isIntercepted(ir.Node node) {
     Selector selector = getSelector(node);
     return _backend.isInterceptedSelector(selector);
   }
 
@@ skipping 512 matching lines @@
     astAdapter.reporter.internalError(
         CURRENT_ELEMENT_SPANNABLE, "Unexpected constant target: $element.");
     return null;
   }
 
   @override
   ConstantExpression visitStringLiteral(ir.StringLiteral node) {
     return new StringConstantExpression(node.value);
   }
 }