Make HCheckPrototypeMaps compatible with parallel recompilation.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index ffec14a545c2b42aa92b13384d7c57e90a35d449..baa0d986b69f5b6d42f9be2d8c55aa23beef05d7 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -2102,8 +2102,10 @@ class LCheckPrototypeMaps: public LTemplateInstruction<1, 0, 1> {
   DECLARE_CONCRETE_INSTRUCTION(CheckPrototypeMaps, "check-prototype-maps")
   DECLARE_HYDROGEN_ACCESSOR(CheckPrototypeMaps)
 
-  Handle<JSObject> prototype() const { return hydrogen()->prototype(); }
-  Handle<JSObject> holder() const { return hydrogen()->holder(); }
+  ZoneList<Handle<JSObject> >* prototypes() const {
+    return hydrogen()->prototypes();
+  }
+  ZoneList<Handle<Map> >* maps() const { return hydrogen()->maps(); }
 };