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

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 6a7d34c8099cea7543dd4b53a67f142d9cf8e2ee..fe396262772028067fd36cebc64df7d280dd367d 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -10895,11 +10895,6 @@ ObjectPool::EntryType ObjectPool::InfoAt(intptr_t index) const {
 }
 
 
-void ObjectPool::SetInfoAt(intptr_t index, EntryType info) const {
-  const TypedData& array = TypedData::Handle(info_array());
-  array.SetInt8(index, static_cast<int8_t>(info));
-}
-
 const char* ObjectPool::ToCString() const {
   return "ObjectPool";
 }