Print new space survival rate in --trace-gc-nvp.

BUG=
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/287873003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -1079,8 +1079,6 @@ bool Heap::PerformGarbageCollection(
     MarkCompact(tracer);
     sweep_generation_++;
 
-    UpdateSurvivalRateTrend(start_new_space_size);
-
     size_of_old_gen_at_last_old_space_gc_ = PromotedSpaceSizeOfObjects();
 
     old_generation_allocation_limit_ =
@@ -1091,10 +1089,10 @@ bool Heap::PerformGarbageCollection(
     tracer_ = tracer;
     Scavenge();
     tracer_ = NULL;
-
-    UpdateSurvivalRateTrend(start_new_space_size);
   }
 
+  UpdateSurvivalRateTrend(start_new_space_size);
+
   if (!new_space_high_promotion_mode_active_ &&
       new_space_.Capacity() == new_space_.MaximumCapacity() &&
       IsStableOrIncreasingSurvivalTrend() &&
@@ -6181,6 +6179,7 @@ GCTracer::~GCTracer() {
     PrintF("nodes_died_in_new=%d ", nodes_died_in_new_space_);
     PrintF("nodes_copied_in_new=%d ", nodes_copied_in_new_space_);
     PrintF("nodes_promoted=%d ", nodes_promoted_);
+    PrintF("survived=%.1f%% ", heap_->survival_rate_);
 
     if (collector_ == SCAVENGER) {
       PrintF("stepscount=%d ", steps_count_since_last_gc_);