Handle named and optional arguments in cps-ir.

pkg/compiler/lib/src/js_backend/codegen/glue.dart

Index: pkg/compiler/lib/src/js_backend/codegen/glue.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/glue.dart b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
index 8edc0ed08f49c68623f9bf28100c1eb39aab4aff..bf92f427b05ddcc170dccdc98ac175d132311a99 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/glue.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
@@ -10,6 +10,7 @@ import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
 import '../../constants/values.dart';
 import '../../elements/elements.dart';
+import '../../constants/expressions.dart';
 
 /// Encapsulates the dependencies of the function-compiler to the compiler,
 /// backend and emitter.
@@ -28,6 +29,10 @@ class Glue {
     return _emitter.constantReference(value);
   }
 
+  ConstantExpression getConstantForVariable(VariableElement variable) {
+    return _backend.constants.getConstantForVariable(variable);
+  }
+
   js.Expression elementAccess(Element element) {
     return _namer.elementAccess(element);
   }