Eliminate unused function maps

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 5093676b15ac886596a070f0552d72fc184c1ab4..43b9034ae18dafb8e2631e99a9cddcb93a4d52dc 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -2168,8 +2168,8 @@ void Class::SetFunctions(const Array& value) const {
   ASSERT(!value.IsNull());
   StorePointer(&raw_ptr()->functions_, value.raw());
   const intptr_t len = value.Length();
-  ClassFunctionsSet set(HashTables::New<ClassFunctionsSet>(len, Heap::kOld));
   if (len >= kFunctionLookupHashTreshold) {
+    ClassFunctionsSet set(HashTables::New<ClassFunctionsSet>(len, Heap::kOld));
     Function& func = Function::Handle();
     for (intptr_t i = 0; i < len; ++i) {
       func ^= value.At(i);
@@ -2177,8 +2177,8 @@ void Class::SetFunctions(const Array& value) const {
       ASSERT(func.Owner() == raw());
       set.Insert(func);
     }
+    StorePointer(&raw_ptr()->functions_hash_table_, set.Release().raw());
   }
-  StorePointer(&raw_ptr()->functions_hash_table_, set.Release().raw());
 }