dump compiler stats from d8 on direct exit from js

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index f5f83d6cfa96d2acf7f740ccf53d04c684d07a74..d7bfad6f16a18e58f08e0ae4a40e7bf1c1ddc23e 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1743,11 +1743,7 @@ void Isolate::Deinit() {
     heap_.mark_compact_collector()->EnsureSweepingCompleted();
   }
 
-  if (turbo_statistics() != NULL) {
-    OFStream os(stdout);
-    os << *turbo_statistics() << std::endl;
-  }
-  if (FLAG_hydrogen_stats) GetHStatistics()->Print();
+  DumpAndResetCompilationStats();
 
   if (FLAG_print_deopt_stress) {
     PrintF(stdout, "=== Stress deopt counter: %u\n", stress_deopt_count_);
@@ -2249,6 +2245,19 @@ void Isolate::UnlinkDeferredHandles(DeferredHandles* deferred) {
 }
 
 
+void Isolate::DumpAndResetCompilationStats() {
+  if (turbo_statistics() != nullptr) {
+    OFStream os(stdout);
+    os << *turbo_statistics() << std::endl;
+  }
+  if (hstatistics() != nullptr) hstatistics()->Print();
+  delete turbo_statistics_;
+  turbo_statistics_ = nullptr;
+  delete hstatistics_;
+  hstatistics_ = nullptr;
+}
+
+
 HStatistics* Isolate::GetHStatistics() {
   if (hstatistics() == NULL) set_hstatistics(new HStatistics());
   return hstatistics();