Make HCheckPrototypeMaps compatible with parallel recompilation.

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 02eb6d38fd80532d23ad583765a40a01cbd4c0e5..6a8d7aa8fb94e908016f4f4b451f441c4d3d6d86 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -2221,8 +2221,10 @@ 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(); }
 };