Make deoptimization stress count global.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index f0ad02da40c19664ed4634a07731061a8d75632e..ece024cdbcf90fa14a91715c2cb86da7dba858e1 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1786,7 +1786,8 @@ Isolate::Isolate()
       optimizing_compiler_thread_(this),
       marking_thread_(NULL),
       sweeper_thread_(NULL),
-      callback_table_(NULL) {
+      callback_table_(NULL),
+      stress_deopt_count_(0) {
   id_ = NoBarrier_AtomicIncrement(&isolate_counter_, 1);
   TRACE_ISOLATE(constructor);
 
@@ -1898,6 +1899,10 @@ void Isolate::Deinit() {
 
     if (FLAG_hydrogen_stats) GetHStatistics()->Print();
 
+    if (FLAG_print_deopt_stress) {
+      PrintF(stdout, "=== Stress deopt counter: %u\n", stress_deopt_count_);
+    }
+
     // We must stop the logger before we tear down other components.
     Sampler* sampler = logger_->sampler();
     if (sampler && sampler->IsActive()) sampler->Stop();
@@ -2132,6 +2137,8 @@ bool Isolate::Init(Deserializer* des) {
   ASSERT(Isolate::Current() == this);
   TRACE_ISOLATE(init);
 
+  stress_deopt_count_ = FLAG_deopt_every_n_times;
+
   if (function_entry_hook() != NULL) {
     // When function entry hooking is in effect, we have to create the code
     // stubs from scratch to get entry hooks, rather than loading the previously