Implement constructor bodies and initializers in CPS->JS backend.

pkg/analyzer2dart/lib/src/cps_generator.dart

Index: pkg/analyzer2dart/lib/src/cps_generator.dart
diff --git a/pkg/analyzer2dart/lib/src/cps_generator.dart b/pkg/analyzer2dart/lib/src/cps_generator.dart
index d9eba2504571fbd526e551d3b7a1b8e0c3a2db00..76d203472144e2654f754507921cd2da61b6c77e 100644
--- a/pkg/analyzer2dart/lib/src/cps_generator.dart
+++ b/pkg/analyzer2dart/lib/src/cps_generator.dart
@@ -50,6 +50,9 @@ class CpsElementVisitor extends analyzer.SimpleElementVisitor<ir.Node> {
 /// Visitor that converts analyzer AST nodes into CPS ir nodes.
 class CpsGeneratingVisitor extends SemanticVisitor<ir.Node>
     with IrBuilderMixin<AstNode> {
+  /// Promote the type of [irBuilder] to [DartIrBuilder].
+  /// The JS backend requires closure conversion which we do not support yet.

[floitsch, 2015/01/21 16:29:34]

new line before?

Just looking at this comment it is not clear what closure conversion has to do
with the up cast.

+  DartIrBuilder get irBuilder => super.irBuilder;
   final analyzer.Element element;
   final ElementConverter converter;