dart2js cps: Access to lazily initialized fields.

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
index 109dc42a284e14a8e1dcb74ad76f9bf597050a79..a221e3b01e4a6f3f1f6ef0af864f440c6b2f8a44 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
@@ -391,9 +391,7 @@ class Not extends Expression {
 class FunctionExpression extends Expression implements DartSpecificNode {
   final FunctionDefinition definition;
 
-  FunctionExpression(this.definition) {
-    assert(definition.element.type.returnType.treatAsDynamic);
-  }
+  FunctionExpression(this.definition);
 
   accept(ExpressionVisitor visitor) => visitor.visitFunctionExpression(this);
   accept1(ExpressionVisitor1 visitor, arg) {
@@ -706,7 +704,7 @@ class FieldDefinition extends RootNode implements DartSpecificNode {
 }
 
 class FunctionDefinition extends RootNode {
-  final FunctionElement element;
+  final ExecutableElement element;
   final List<Variable> parameters;
   Statement body;
   final List<ConstDeclaration> localConstants;
@@ -873,6 +871,8 @@ class SetField extends Expression implements JsSpecificNode {
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitSetField(this, arg);
 }
 
+/// Read the value of a field, possibly provoking its initializer to evaluate,
+/// or tear off a static method.
 class GetStatic extends Expression {
   Element element;
   SourceInformation sourceInformation;
@@ -883,7 +883,6 @@ class GetStatic extends Expression {
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitGetStatic(this, arg);
 }
 
-
 class SetStatic extends Expression {
   Element element;
   Expression value;