dart2js cps: Handle error cases.

pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
index ae35ea7d9a4d4fe989e40ed45572979103cd8b58..a807214f2ed75eafc917023cbaccec617e53e723 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
@@ -369,6 +369,11 @@ class IRTracer extends TracerUtil implements cps_ir.Visitor {
     String value = formatReference(node.value);
     return "NonTailThrow($value)";
   }
+
+  visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
+    String args = node.arguments.map(formatReference).join(', ');
+    return "CreateInvocationMirror(${node.selector.name}, $args)";
+  }
 }
 
 /**
@@ -624,4 +629,8 @@ class BlockCollector implements cps_ir.Visitor {
   visitNonTailThrow(cps_ir.NonTailThrow node) {
     unexpectedNode(node);
   }
+
+  visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
+    unexpectedNode(node);
+  }
 }