Fix gcmole warning in EnsureSlotContainsAllocationSite().

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/268443002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21087 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/full-codegen.cc

@@ -364,7 +364,9 @@ unsigned FullCodeGenerator::EmitBackEdgeTable() {
 void FullCodeGenerator::EnsureSlotContainsAllocationSite(int slot) {
   Handle<FixedArray> vector = FeedbackVector();
   if (!vector->get(slot)->IsAllocationSite()) {
-    vector->set(slot, *isolate()->factory()->NewAllocationSite());
+    Handle<AllocationSite> allocation_site =
+        isolate()->factory()->NewAllocationSite();
+    vector->set(slot, *allocation_site);
   }
 }