Simplify CheckPrototypeMaps.

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 8a8ac2639ce9def1566477d2b66d825924f24cb1..f3f579dcb15e840a7a84aa8d68f462890ec7a27f 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -76,6 +76,7 @@ class LCodeGen;
 //   LCallNamed
 //   LCallRuntime
 //   LCallStub
+//   LCheckPrototypeMaps
 //   LConstant
 //     LConstantD
 //     LConstantI
@@ -109,7 +110,6 @@ class LCodeGen;
 //     LCheckFunction
 //     LCheckInstanceType
 //     LCheckMap
-//     LCheckPrototypeMaps
 //     LCheckSmi
 //     LClassOfTest
 //     LClassOfTestAndBranch
@@ -1603,8 +1603,9 @@ class LCheckPrototypeMaps: public LInstruction {
   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(); }
-  Handle<Map> receiver_map() const { return hydrogen()->receiver_map(); }
+
   LOperand* temp1() const { return temp1_; }
   LOperand* temp2() const { return temp2_; }