dart2dart: Fixed assertions in IR.

sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart

Index: sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart b/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
index 85122e519c1cfd4d7da430937293d28bcfe32da8..af26952365a39f9ea6259e826f21056c96e18258 100644
--- a/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
@@ -1402,7 +1402,7 @@ class IrBuilder extends ResolvedVisitor<ir.Primitive> {
       assignedVars[variableIndex[element]] = valueToStore;
     } else if ((!node.isSuperCall && Elements.isErroneousElement(element)) ||
                 Elements.isStaticOrTopLevel(element)) {
-      assert(element.isField || element.isSetter);
+      assert(element.isErroneous || element.isField || element.isSetter);
       Selector selector = elements.getSelector(node);
       continueWithExpression(
           (k) => new ir.InvokeStatic(element, selector, k, [valueToStore]));