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

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 79bbbc34e231ad9b68dd0765dcd43d9bef0c48f3..2f1b2cce8915d491a0cab9d484b5c568144cc915 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -1827,7 +1827,7 @@ HValue* HGraphBuilder::BuildCreateIterResultObject(HValue* value,
   // 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();