Simplify CheckPrototypeMaps.

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 326ce7250eb0e824fe6f6de6359c28b600c67f03..5f70379e12df4e0aef347873cd94c24b79c91482 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -77,6 +77,7 @@ class LCodeGen;
 //   LCallNamed
 //   LCallRuntime
 //   LCallStub
+//   LCheckPrototypeMaps
 //   LConstant
 //     LConstantD
 //     LConstantI
@@ -111,7 +112,6 @@ class LCodeGen;
 //     LCheckFunction
 //     LCheckInstanceType
 //     LCheckMap
-//     LCheckPrototypeMaps
 //     LCheckSmi
 //     LClassOfTest
 //     LClassOfTestAndBranch
@@ -1687,8 +1687,8 @@ class LCheckPrototypeMaps: public LTemplateInstruction<0, 0, 0> {
   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* temp() const { return temp_; }