Backport https://code.google.com/p/v8/source/detail?r=19360 to 3.24.35

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index d93a862294aa13d7afde5b54b4332faaf752ff3f..6c2626d8b0faba5b00e3f7f368b1999ba25211bf 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1153,6 +1153,14 @@ class Isolate {
   // Given an address occupied by a live code object, return that object.
   Object* FindCodeObject(Address a);
 
+  int NextOptimizationId() {
+    int id = next_optimization_id_++;
+    if (!Smi::IsValid(next_optimization_id_)) {
+      next_optimization_id_ = 0;
+    }
+    return id;
+  }
+
  private:
   Isolate();
 
@@ -1384,6 +1392,8 @@ class Isolate {
   // Counts deopt points if deopt_every_n_times is enabled.
   unsigned int stress_deopt_count_;
 
+  int next_optimization_id_;
+
   friend class ExecutionAccess;
   friend class HandleScopeImplementer;
   friend class IsolateInitializer;