Add flag to print stack-trace after n allocations.

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index 12c46069eb52ccc9054f075edcff49c62bed5cb4..38deb1f31df4c49b8325dd79a04e4ce813116e72 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -213,9 +213,9 @@ void Heap::OnAllocationEvent(HeapObject* object, int size_in_bytes) {
     profiler->AllocationEvent(object->address(), size_in_bytes);
   }
 
-  if (FLAG_verify_predictable) {
-    ++allocations_count_;
+  ++allocations_count_;
 
+  if (FLAG_verify_predictable) {
     UpdateAllocationsHash(object);
     UpdateAllocationsHash(size_in_bytes);
 
@@ -225,6 +225,12 @@ void Heap::OnAllocationEvent(HeapObject* object, int size_in_bytes) {
       PrintAlloctionsHash();
     }
   }
+
+  if (FLAG_trace_allocation_stack_interval > 0) {
+    if (allocations_count_ % FLAG_trace_allocation_stack_interval == 0) {
+      isolate()->PrintStack(stdout, Isolate::kPrintStackConcise);
+    }
+  }
 }