Remove parent_level field of function type parameters.

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/bootstrap.h"
 #include "vm/compiler.h"
 #include "vm/constant_propagator.h"
@@ skipping 2046 matching lines @@
 
   return this;
 }
 
 
 Definition* AssertAssignableInstr::Canonicalize(FlowGraph* flow_graph) {
   if (FLAG_eliminate_type_checks &&
       value()->Type()->IsAssignableTo(dst_type())) {
     return value()->definition();
   }
-
+  if (dst_type().IsInstantiated()) {
+    return this;
+  }
   // For uninstantiated target types: If the instantiator and function
   // type arguments are constant, instantiate the target type here.
-  // If the uninstantiated type refers to parent function type parameters, we
-  // cannot instantiated it here.
-  if (dst_type().IsInstantiated() ||
-      !dst_type().IsInstantiated(kParentFunctions)) {
-    return this;
-  }
-
   ConstantInstr* constant_instantiator_type_args =
       instantiator_type_arguments()->definition()->AsConstant();
   ConstantInstr* constant_function_type_args =
       function_type_arguments()->definition()->AsConstant();
   if ((constant_instantiator_type_args != NULL) &&
       (constant_function_type_args != NULL)) {
     ASSERT(constant_instantiator_type_args->value().IsNull() ||
            constant_instantiator_type_args->value().IsTypeArguments());
     ASSERT(constant_function_type_args->value().IsNull() ||
            constant_function_type_args->value().IsTypeArguments());
@@ skipping 1920 matching lines @@
                      "native function '%s' (%" Pd " arguments) cannot be found",
                      native_name().ToCString(), function().NumParameters());
   }
   set_is_auto_scope(auto_setup_scope);
   set_native_c_function(native_function);
 }
 
 #undef __
 
 }  // namespace dart