Index synthetic top-level variable and 'loadLibrary' references.

pkg/analyzer/lib/src/summary/index_unit.dart

Index: pkg/analyzer/lib/src/summary/index_unit.dart
diff --git a/pkg/analyzer/lib/src/summary/index_unit.dart b/pkg/analyzer/lib/src/summary/index_unit.dart
index 3ad356b9c22a7af7477c96641cb81900c6004545..9b47fd1d85bad7ac7c5bac5b2c2b12e946de6f93 100644
--- a/pkg/analyzer/lib/src/summary/index_unit.dart
+++ b/pkg/analyzer/lib/src/summary/index_unit.dart
@@ -204,12 +204,20 @@ class PackageIndexAssembler {
       if (element is ConstructorElement) {
         kind = IndexSyntheticElementKind.constructor;
         element = element.enclosingElement;
+      } else if (element is FunctionElement && element.name == 'loadLibrary') {
+        kind = IndexSyntheticElementKind.loadLibrary;
+        element = element.library;
       } else if (element is PropertyAccessorElement) {
-        PropertyAccessorElement property = element;
-        kind = property.isGetter
+        PropertyAccessorElement accessor = element;
+        kind = accessor.isGetter
             ? IndexSyntheticElementKind.getter
             : IndexSyntheticElementKind.setter;
         element = element.enclosingElement;
+      } else if (element is TopLevelVariableElement) {
+        TopLevelVariableElement property = element;
+        kind = IndexSyntheticElementKind.topLevelVariable;
+        element = property.getter;
+        element ??= property.setter;
       } else {
         throw new ArgumentError(
             'Unsupported synthetic element ${element.runtimeType}');