dart2js cps: Use oneshot interceptors and 'instanceof' expressions.

pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
index 2bc2dd28257c8e7a0f7d721a4dbaf21c6f1c4562..f43f2873d8262bab9b15eae8406e41b3c20d1a58 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
@@ -411,6 +411,12 @@ class SubexpressionVisitor extends ExpressionVisitor<String> {
     return "$keyword $callName($args)";
   }
 
+  String visitOneShotInterceptor(OneShotInterceptor node) {
+    String name = node.selector.name;
+    String args = formatArguments(node);
+    return "oneshot $name($args)";
+  }
+
   String visitLiteralList(LiteralList node) {
     String values = node.values.map(visitExpression).join(', ');
     return "list [$values]";