[runtime] We don't need an actual instance type for JSIteratorResult.

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 1809 matching lines @@
 }
 
 
 HValue* HGraphBuilder::BuildCreateIterResultObject(HValue* value,
                                                    HValue* done) {
   NoObservableSideEffectsScope scope(this);
 
   // Allocate the JSIteratorResult object.
   HValue* result =
       Add<HAllocate>(Add<HConstant>(JSIteratorResult::kSize), HType::JSObject(),
-                     NOT_TENURED, JS_ITERATOR_RESULT_TYPE);
+                     NOT_TENURED, JS_OBJECT_TYPE);
 
   // Initialize the JSIteratorResult object.
   HValue* native_context = BuildGetNativeContext();
   HValue* map = Add<HLoadNamedField>(
       native_context, nullptr,
       HObjectAccess::ForContextSlot(Context::ITERATOR_RESULT_MAP_INDEX));
   Add<HStoreNamedField>(result, HObjectAccess::ForMap(), map);
   HValue* empty_fixed_array = Add<HLoadRoot>(Heap::kEmptyFixedArrayRootIndex);
   Add<HStoreNamedField>(result, HObjectAccess::ForPropertiesPointer(),
                         empty_fixed_array);
@@ skipping 11814 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8