cps-ir: Support compilation of methods that use interceptor calling convention.

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 2210f7046c36fac42b655a33aabd30f340c180d9..6c75c839988b3ef1f16e3990e9e1df7c0a69145e 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/glue.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/glue.dart
@@ -212,4 +212,8 @@ class Glue {
   String getTypeTestTag(DartType type) {
     return _backend.namer.operatorIsType(type);
   }
+
+  bool operatorEqHandlesNullArgument(FunctionElement element) {
+    return _backend.operatorEqHandlesNullArgument(element);
+  }
 }