Refactored treatment of closure variables in dart2js CPS.

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 b8ca03926356dc802591007acea44cf0bd8e4482..7efa4230461449f143e5dbec2adc3d6d24876d7f 100644
--- a/pkg/analyzer2dart/lib/src/cps_generator.dart
+++ b/pkg/analyzer2dart/lib/src/cps_generator.dart
@@ -87,7 +87,7 @@ class CpsGeneratingVisitor extends SemanticVisitor<ir.Node>
       function.parameters.forEach((analyzer.ParameterElement parameter) {
         // TODO(johnniwinther): Support "closure variables", that is variables
         // accessed from an inner function.
-        irBuilder.createParameter(converter.convertElement(parameter));
+        irBuilder.createFunctionParameter(converter.convertElement(parameter));
       });
       // Visit the body directly to avoid processing the signature as
       // expressions.