Don't detect runtime type information use except in the codegen queue.

lib/compiler/implementation/enqueue.dart

Index: lib/compiler/implementation/enqueue.dart
diff --git a/lib/compiler/implementation/enqueue.dart b/lib/compiler/implementation/enqueue.dart
index ad100c0231091f70d0b0f61ebc0dd55d8fc5ee71..1a6797dbe9098f50bde8f4740bd437bcb54f3762 100644
--- a/lib/compiler/implementation/enqueue.dart
+++ b/lib/compiler/implementation/enqueue.dart
@@ -129,7 +129,9 @@ class Enqueuer {
     queue.add(new WorkItem(element, elements, itemCompilationContextCreator()));
 
     // Enable runtime type support if we discover a getter called runtimeType.
-    if (element.isGetter() && element.name == Compiler.RUNTIME_TYPE) {
+    if (!isResolutionQueue &&
+        element.isGetter() &&
+        element.name == Compiler.RUNTIME_TYPE) {
       compiler.enabledRuntimeType = true;
     }