Turn off pre-tenuring of fast literals when we turn off high promotion mode.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 3c88980a576e8bcfc689fb6f6c62cfd93ae8fffb..670097e815cefc4aa09ec492f8a0fcbcbd47aac7 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -970,6 +970,11 @@ bool Heap::PerformGarbageCollection(GarbageCollector collector,
       PrintPID("Unlimited new space size due to low promotion rate: %d MB\n",
                new_space_.MaximumCapacity() / MB);
     }
+    // Trigger deoptimization here to turn off pre-tenuring as soon as
+    // possible.
+    if (FLAG_pretenure_literals) {
+      isolate_->stack_guard()->FullDeopt();
+    }
   }
 
   if (new_space_high_promotion_mode_active_ &&