Index: lib/Core/Resolver.cpp
===================================================================
--- lib/Core/Resolver.cpp
+++ lib/Core/Resolver.cpp
@@ -341,7 +341,8 @@
 // to the new defined atom
 void Resolver::updateReferences() {
   ScopedTask task(getDefaultDomain(), "updateReferences");
-  for (const Atom *atom : _atoms) {
+  parallel_for_each(_atoms.begin(), _atoms.end(),
+      [&](const Atom *atom) {
     if (const DefinedAtom *defAtom = dyn_cast<DefinedAtom>(atom)) {
       for (const Reference *ref : *defAtom) {
         // A reference of type kindAssociate should't be updated.
@@ -358,7 +359,7 @@
         const_cast<Reference *>(ref)->setTarget(newTarget);
       }
     }
-  }
+  });
 }
 
 // For dead code stripping, recursively mark atoms "live"