Various redemptions

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

Index: pkg/compiler/lib/src/universe/codegen_world_builder.dart
diff --git a/pkg/compiler/lib/src/universe/codegen_world_builder.dart b/pkg/compiler/lib/src/universe/codegen_world_builder.dart
index 8a22cbba4ac1679eefd2d2d7d1d832c7588ed7fc..6cbe723b0500fd1ecc53fb465133694985ad4cc6 100644
--- a/pkg/compiler/lib/src/universe/codegen_world_builder.dart
+++ b/pkg/compiler/lib/src/universe/codegen_world_builder.dart
@@ -588,10 +588,8 @@ class ElementCodegenWorldBuilderImpl extends CodegenWorldBuilderImpl {
     parameters.orderedForEachParameter((_parameter) {
       ParameterElement parameter = _parameter;
       ConstantValue value;
-      if (parameter.constant != null) {
+      if (parameter.isOptional) {
         value = _constants.getConstantValue(parameter.constant);
-      } else {
-        value = new NullConstantValue();
       }
       f(parameter.type, parameter.name, value);
     });