Support is/as expressions in analyzer2dart.

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 60d2335c201499798b7af8265e46b176356cbcec..05df3b8f33495ea0f9f827ff2908d6acbf86d346 100644
--- a/pkg/analyzer2dart/lib/src/cps_generator.dart
+++ b/pkg/analyzer2dart/lib/src/cps_generator.dart
@@ -343,4 +343,21 @@ class CpsGeneratingVisitor extends SemanticVisitor<ir.Node>
     irBuilder.buildWhile(buildCondition: subbuild(node.condition),
                          buildBody: subbuild(node.body));
   }
+
+  @override
+  ir.Primitive visitIsExpression(IsExpression node) {
+    return irBuilder.buildTypeOperator(
+        visit(node.expression),
+        converter.convertType(node.type.type),
+        isTypeTest: true,
+        isNotCheck: node.notOperator != null);
+  }
+
+  @override
+  ir.Primitive visitAsExpression(AsExpression node) {
+    return irBuilder.buildTypeOperator(
+        visit(node.expression),
+        converter.convertType(node.type.type),
+        isTypeTest: false);
+  }
 }