Make old generation allocation throughput stats independent from the new space allocation throughpu…

src/heap/gc-idle-time-handler.h

Index: src/heap/gc-idle-time-handler.h
diff --git a/src/heap/gc-idle-time-handler.h b/src/heap/gc-idle-time-handler.h
index c3701746d39b28edc95890d90199a7f80a1718e9..c50d6d33fb857e56477a94b61922f4f5971e521b 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -181,6 +181,7 @@ class GCIdleTimeHandler {
     bool can_start_incremental_marking;
     bool sweeping_in_progress;
     bool sweeping_completed;
+    bool has_low_allocation_rate;
     size_t mark_compact_speed_in_bytes_per_ms;
     size_t incremental_marking_speed_in_bytes_per_ms;
     size_t final_incremental_mark_compact_speed_in_bytes_per_ms;
@@ -188,7 +189,6 @@ class GCIdleTimeHandler {
     size_t used_new_space_size;
     size_t new_space_capacity;
     size_t new_space_allocation_throughput_in_bytes_per_ms;
-    size_t current_allocation_throughput_in_bytes_per_ms;
   };
 
   GCIdleTimeHandler()