Add StaticUse for more precise registration of statically known element use.

pkg/compiler/lib/src/js_backend/type_variable_handler.dart

Index: pkg/compiler/lib/src/js_backend/type_variable_handler.dart
diff --git a/pkg/compiler/lib/src/js_backend/type_variable_handler.dart b/pkg/compiler/lib/src/js_backend/type_variable_handler.dart
index c00e46c0cd6284e67ef7ec6a2b08351d245d183b..3fb220a8fdab7efbde273c57f7d1ab0564312858 100644
--- a/pkg/compiler/lib/src/js_backend/type_variable_handler.dart
+++ b/pkg/compiler/lib/src/js_backend/type_variable_handler.dart
@@ -56,7 +56,9 @@ class TypeVariableHandler {
         _backend.registerInstantiatedType(
             _typeVariableClass.rawType, enqueuer, registry);
         enqueuer.registerStaticUse(
-            _backend.registerBackendUse(_backend.helpers.createRuntimeType));
+            new StaticUse.staticInvoke(
+                _backend.registerBackendUse(_backend.helpers.createRuntimeType),
+                CallStructure.ONE_ARG));
         _seenClassesWithTypeVariables = true;
       }
     } else {