Add field nested_sites to AllocationSite.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 505bc80d09d17f4dff8e629e7f8388b25fd31ae9..3d019f13e008962fd534a9c3a9f9ea3a5a3d2e8e 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5697,6 +5697,10 @@ class HObjectAccess V8_FINAL {
     return HObjectAccess(kInobject, AllocationSite::kTransitionInfoOffset);
   }
 
+  static HObjectAccess ForAllocationSiteNestedSite() {
+    return HObjectAccess(kInobject, AllocationSite::kNestedSiteOffset);
+  }
+
   static HObjectAccess ForAllocationSiteDependentCode() {
     return HObjectAccess(kInobject, AllocationSite::kDependentCodeOffset);
   }