Implement type argument access and reification of runtime types.

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 4f483fe3fedc375c7ff80627f35cb1b5467c19c7..97314262323c6e1d92b1a87c2d2bd6c63280cae9 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart
@@ -337,6 +337,17 @@ class IRTracer extends TracerUtil implements cps_ir.Visitor {
     String variable = names.name(node.variable.definition);
     return 'GetMutableVariable $variable';
   }
+
+  @override
+  visitReadTypeVariable(cps_ir.ReadTypeVariable node) {
+    return "ReadTypeVariable ${node.variable.element} "
+        "${formatReference(node.target)}";
+  }
+
+  @override
+  visitReifyRuntimeType(cps_ir.ReifyRuntimeType node) {
+    return "ReifyRuntimeType ${formatReference(node.value)}";
+  }
 }
 
 /**
@@ -574,4 +585,14 @@ class BlockCollector implements cps_ir.Visitor {
   visitInterceptor(cps_ir.Interceptor node) {
     unexpectedNode(node);
   }
+
+  @override
+  visitReadTypeVariable(cps_ir.ReadTypeVariable node) {
+    unexpectedNode(node);
+  }
+
+  @override
+  visitReifyRuntimeType(cps_ir.ReifyRuntimeType node) {
+    unexpectedNode(node);
+  }
 }