Introduce .isMalformed

pkg/compiler/lib/src/universe/call_structure.dart

Index: pkg/compiler/lib/src/universe/call_structure.dart
diff --git a/pkg/compiler/lib/src/universe/call_structure.dart b/pkg/compiler/lib/src/universe/call_structure.dart
index 461950fdeafd3ae3524827b4d937aad6f2dc07a3..727390af3362a5c70b540ade354b2bc3b65b9029 100644
--- a/pkg/compiler/lib/src/universe/call_structure.dart
+++ b/pkg/compiler/lib/src/universe/call_structure.dart
@@ -186,8 +186,8 @@ class CallStructure {
       ConstructorElement callee,
       /*T*/ compileArgument(ParameterElement element),
       /*T*/ compileConstant(ParameterElement element)) {
-    assert(invariant(caller, !callee.isErroneous,
-        message: "Cannot compute arguments to erroneous constructor: "
+    assert(invariant(caller, !callee.isMalformed,
+        message: "Cannot compute arguments to malformed constructor: "
                  "$caller calling $callee."));
 
     FunctionSignature signature = caller.functionSignature;