Dampen the old generation allocation limit only after the initial old generation size was configure…

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 764d1003e9bfbf8bb25f9c8c31fff90fe5616143..78618798dde37220297a6953a21f0fdb1a8c1646 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1296,7 +1296,8 @@ bool Heap::PerformGarbageCollection(
     amount_of_external_allocated_memory_at_last_global_gc_ =
         amount_of_external_allocated_memory_;
     SetOldGenerationAllocationLimit(old_gen_size, gc_speed, mutator_speed);
-  } else if (HasLowYoungGenerationAllocationRate()) {
+  } else if (HasLowYoungGenerationAllocationRate() &&
+             old_generation_size_configured_) {
     DampenOldGenerationAllocationLimit(old_gen_size, gc_speed, mutator_speed);
   }