Keep a trail while checking upper bounds in the VM in order to properly handle

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 2039 matching lines @@
   ConstantInstr* constant_type_args =
       instantiator_type_arguments()->definition()->AsConstant();
   if (constant_type_args != NULL &&
       !constant_type_args->value().IsNull() &&
       constant_type_args->value().IsTypeArguments()) {
     const TypeArguments& instantiator_type_args =
         TypeArguments::Cast(constant_type_args->value());
     Error& bound_error = Error::Handle();
     const AbstractType& new_dst_type = AbstractType::Handle(
         dst_type().InstantiateFrom(
-            instantiator_type_args, &bound_error, NULL, Heap::kOld));
+            instantiator_type_args, &bound_error, NULL, NULL, Heap::kOld));
     // If dst_type is instantiated to dynamic or Object, skip the test.
     if (!new_dst_type.IsMalformedOrMalbounded() && bound_error.IsNull() &&
         (new_dst_type.IsDynamicType() || new_dst_type.IsObjectType())) {
       return value()->definition();
     }
     set_dst_type(AbstractType::ZoneHandle(new_dst_type.Canonicalize()));
     if (FLAG_eliminate_type_checks &&
         value()->Type()->IsAssignableTo(dst_type())) {
       return value()->definition();
     }
@@ skipping 266 matching lines @@
 static bool MayBeBoxableNumber(intptr_t cid) {
   return (cid == kDynamicCid) ||
          (cid == kMintCid) ||
          (cid == kBigintCid) ||
          (cid == kDoubleCid);
 }
 
 
 static bool MaybeNumber(CompileType* type) {
   ASSERT(Type::Handle(Type::Number()).IsMoreSpecificThan(
-         Type::Handle(Type::Number()), NULL, Heap::kOld));
+             Type::Handle(Type::Number()), NULL, NULL, Heap::kOld));
   return type->ToAbstractType()->IsDynamicType()
       || type->ToAbstractType()->IsObjectType()
       || type->ToAbstractType()->IsTypeParameter()
       || type->IsMoreSpecificThan(Type::Handle(Type::Number()));
 }
 
 
 // Returns a replacement for a strict comparison and signals if the result has
 // to be negated.
 static Definition* CanonicalizeStrictCompare(StrictCompareInstr* compare,
@@ skipping 1373 matching lines @@
   set_native_c_function(native_function);
   function().SetIsNativeAutoSetupScope(auto_setup_scope);
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   set_is_bootstrap_native(is_bootstrap_native);
 }
 
 #undef __
 
 }  // namespace dart