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 1daf847166f7691ef7ae98bbb639053f1a3f6ce3..2ccfd5d9b041db5d121daf3e297ed667fc0e2205 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -2231,8 +2231,10 @@ 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(); }
 };