Compute constants from IR nodes

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

Index: pkg/compiler/lib/src/js_backend/runtime_types.dart
diff --git a/pkg/compiler/lib/src/js_backend/runtime_types.dart b/pkg/compiler/lib/src/js_backend/runtime_types.dart
index f0488d9ffef4b6c57615c4aff75d6ef8c6da2d09..5aedd5645c9d1f04e08db35b2f0f37314183dd24 100644
--- a/pkg/compiler/lib/src/js_backend/runtime_types.dart
+++ b/pkg/compiler/lib/src/js_backend/runtime_types.dart
@@ -931,6 +931,11 @@ class RuntimeTypesEncoderImpl implements RuntimeTypesEncoder {
       return namer.uniqueNameForTypeConstantElement(
           type.element.library, type.element);
     }
+    if (type is FunctionType) {
+      // TODO(johnniwinther): Add naming scheme for function type literals.
+      // These currently only occur from kernel.
+      return '()->';
+    }
     InterfaceType interface = type;
     String name = namer.uniqueNameForTypeConstantElement(
         interface.element.library, interface.element);