Make creation of list literal more resilient to changes in the underlying

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 14985)
+++ runtime/vm/object.h	(working copy)
@@ -3222,9 +3222,6 @@
   // Check if this type represents the 'Function' type.
   bool IsFunctionType() const;
 
-  // Check if this type represents the 'List' interface.
-  bool IsListInterface() const;
-
   // Check if this type is an interface type.
   bool IsInterfaceType() const {
     if (!HasResolvedTypeClass()) {
@@ -3343,12 +3340,12 @@
   // The 'String' type.
   static RawType* StringType();
 
+  // The 'Array' type.
+  static RawType* ArrayType();
+
   // The 'Function' interface type.
   static RawType* Function();
 
-  // The 'List' interface type.
-  static RawType* ListInterface();
-
   // The finalized type of the given non-parameterized class.
   static RawType* NewNonParameterizedType(const Class& type_class);
 
@@ -4257,6 +4254,7 @@
     return raw_ptr()->type_arguments_;
   }
   virtual void SetTypeArguments(const AbstractTypeArguments& value) const {
+    ASSERT(value.IsNull() || ((value.Length() == 1) && value.IsInstantiated()));
     StorePointer(&raw_ptr()->type_arguments_, value.raw());
   }
 
@@ -4384,6 +4382,7 @@
     return raw_ptr()->type_arguments_;
   }
   virtual void SetTypeArguments(const AbstractTypeArguments& value) const {
+    ASSERT(value.IsNull() || ((value.Length() == 1) && value.IsInstantiated()));
     const Array& contents = Array::Handle(data());
     contents.SetTypeArguments(value);
     StorePointer(&raw_ptr()->type_arguments_, value.raw());