Add old generation allocation throughput computation.

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

Index: src/heap/gc-idle-time-handler.cc
diff --git a/src/heap/gc-idle-time-handler.cc b/src/heap/gc-idle-time-handler.cc
index 86587c6fd19671d919a291da07a31a21fcdf4886..496d7a061c2965b5f7630a9e8a1432466b417ba3 100644
--- a/src/heap/gc-idle-time-handler.cc
+++ b/src/heap/gc-idle-time-handler.cc
@@ -60,8 +60,8 @@ void GCIdleTimeHandler::HeapState::Print() {
   PrintF("new_space_capacity=%" V8_PTR_PREFIX "d ", new_space_capacity);
   PrintF("new_space_allocation_throughput=%" V8_PTR_PREFIX "d ",
          new_space_allocation_throughput_in_bytes_per_ms);
-  PrintF("current_new_space_allocation_throughput=%" V8_PTR_PREFIX "d",
-         current_new_space_allocation_throughput_in_bytes_per_ms);
+  PrintF("current_allocation_throughput=%" V8_PTR_PREFIX "d",
+         current_allocation_throughput_in_bytes_per_ms);
 }