Make NoReloadScope thread safe

runtime/vm/atomic.h

Index: runtime/vm/atomic.h
diff --git a/runtime/vm/atomic.h b/runtime/vm/atomic.h
index d6a833bb313b61e5fe8a3c548e89eeef1ba02cfc..af4eddf4b79e1a72a67ca935e23ddd8a51383e09 100644
--- a/runtime/vm/atomic.h
+++ b/runtime/vm/atomic.h
@@ -34,6 +34,7 @@ class AtomicOperations : public AllStatic {
   // NOTE: Not to be used for any atomic operations involving memory locations
   // that are accessed by generated code.
   static uintptr_t FetchAndDecrement(uintptr_t* p);
+  static intptr_t FetchAndDecrement(intptr_t* p);

[Florian Schneider, 2016/09/16 16:22:41]

Not needed? If we need both variants, I'd make this a template function (see
LoadRelaxed)

[Cutch, 2016/09/16 16:45:30]

Oops. I meant to delete this.

 
   // Atomically decrement the value at p by 'value'.
   //