VM: Hoist handle allocation out of loop when creating the object pool.

runtime/vm/assembler.cc

Index: runtime/vm/assembler.cc
diff --git a/runtime/vm/assembler.cc b/runtime/vm/assembler.cc
index 3f3e61a12d2b70e046b5d734e739b2f74d96ac10..9d17b1b49db85872fd135fe84c0aa9589050be0d 100644
--- a/runtime/vm/assembler.cc
+++ b/runtime/vm/assembler.cc
@@ -312,9 +312,10 @@ RawObjectPool* ObjectPoolWrapper::MakeObjectPool() {
     return Object::empty_object_pool().raw();
   }
   const ObjectPool& result = ObjectPool::Handle(ObjectPool::New(len));
+  const TypedData& info_array = TypedData::Handle(result.info_array());
   for (intptr_t i = 0; i < len; ++i) {
     ObjectPool::EntryType info = object_pool_[i].type_;
-    result.SetInfoAt(i, info);
+    info_array.SetInt8(i, static_cast<int8_t>(info));
     if (info == ObjectPool::kTaggedObject) {
       result.SetObjectAt(i, *object_pool_[i].obj_);
     } else {