dart2js-kernel: Handle ir.TypeLiteral for type variables

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 1952e26136c88814e616400b818dee3b8c5cb2e3..bcecfae838ccdc1184498a109281981c84ef743d 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -389,6 +389,16 @@ class KernelAstAdapter {
   TypeMask get assertThrowReturnType => TypeMaskFactory
       .inferredReturnTypeForElement(_backend.helpers.assertThrow, _compiler);
 
+  ir.Procedure get runtimeTypeToString =>
+      kernel.functions[_backend.helpers.runtimeTypeToString];
+
+  ir.Procedure get createRuntimeType =>
+      kernel.functions[_backend.helpers.createRuntimeType];
+
+  TypeMask get createRuntimeTypeReturnType =>
+      TypeMaskFactory.inferredReturnTypeForElement(
+          _backend.helpers.createRuntimeType, _compiler);
+
   ir.Class get objectClass => kernel.classes[_compiler.coreClasses.objectClass];
 
   ir.Procedure get currentIsolate =>