Instruction selection before removing HTypeKnown

sdk/lib/_internal/compiler/implementation/ssa/tracer.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/tracer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/tracer.dart b/sdk/lib/_internal/compiler/implementation/ssa/tracer.dart
index 37731ba36fd9bd7429291f6ceb9226e910ff285a..1d18a1666e407f9a786f194d2a300123838a780c 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/tracer.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/tracer.dart
@@ -508,6 +508,11 @@ class HInstructionStringifier implements HVisitor<String> {
     return "TypeTest: ${temporaryId(node.expression)} is $type";
   }
 
+  String visitIsViaInterceptor(HIsViaInterceptor node) {
+    String type = node.typeExpression.toString();
+    return "TypeTest: ${temporaryId(node.inputs[0])} is $type";
+  }
+
   String visitTypeConversion(HTypeConversion node) {
     assert(node.inputs.length <= 2);
     String otherInput = (node.inputs.length == 2)